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914/4 Porsche Replacement Wiring Harnesses

Jeff Bowlsby San Ramon, California

Email Me

Please contact me to tell me what items you want and your zip code,

and I will respond with a full quote including shipping cost and payment details.

Our harnesses are in customers classic vintage

Porsche's, VW's and other German cars throughout the world.

Australia, Austria, Belgium, Brazil, Canada, England, France,

Germany, Italy, Japan, Kenya, Mexico, New Zealand, Norway,

Portugal, Scotland, South Africa, Spain, Sweden, Switzerland, USA and more.

A sincere Thank You to our customers!

OVER 1,100

Porsche 914/912E, Mercedes Benz, BMW E9 and VW TIII/TIV,

D-Jet and L-Jet wiring harnesses and MPS’s, built or repaired, since 2001

--- This website last updated in January 2023 ---

Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.

This site is not affiliated with Porsche in any way. All other trademarks are property of their respective owners.

Quicklinks

Examples of wiring harnesses we build

Some specialized equipment and tooling we use

914/4 Porsche NOS Wiring Harness Gallery

914/4 Porsche Wiring Harness Diagrams – Reference Library

Availability and Pricing Chart

Engine bay harnesses

Supplemental harnesses

Miscellaneous

Does your existing wiring harness look like this rats nest?

Broken casing, deteriorated or missing boots, spliced or cut off branches, melted, brittle or broken wires causing internal shorts?

You can be certain that the original wire terminals are definitely dirty, corroded and worn out.

All of these conditions adversely affect the electrical connectivity of a wiring harness.

No Connectivity, No Joy

Replacement Porsche 914 Wiring Harnesses

The engine bay wiring harnesses in our Porsche 914 cars are vitally important components and are exposed to severe degradation and contamination from heat, vibration, rain, oil and just ordinary handling. The original wiring in our 914s is four decades old and new OEM wiring harnesses are not available anymore. The unique original parts for harness repairs are nearly impossible to find…you will not find them at your neighborhood hardware store or even at the best German car parts stores. Used original wiring harnesses can be found, but these original wiring harnesses, are also likely to be at the end of their service life. Heat degradation and fluid contamination cause the harness casing, protective rubber boots and wire insulation to harden, crack and break off, eventually causing internal wiring harness shorts. Vibration contributes to wire breakage at wire terminals and intermittent contact. Dirt and corrosion at the wire terminal connections inhibit electrical conductivity. ~40 years of disconnecting and reconnecting the connectors from the engine simply wears the wiring harnesses and their connections out and causes them to fail. With any of these conditions you could be sitting by the side of the road instead of canyon carving. Installing carbs is not your only option, and may not be the best solution either.

We rebuild repair and restore the critical engine bay wiring harnesses for the Porsche 914. We make replacement wiring harnesses for the harnesses that see the most abuse and deterioration because we want to do our part to keep these great cars on the road for many years to come. Not surprisingly, many customers have conveyed to us how these replacement harnesses have cured long term, previously undiagnosed problems such as intermittent stumbling, a bouncy tach, a faulty idle, lean/rich conditions, or that replacing or repairing a harness was the actual solution to what was thought to be a faulty fuel injector, bad pressure sensor, defective coil or an electrical system charging problem.

Let us explain what we mean by ‘rebuilt’. We could easily call these harnesses ‘new’ and mostly they are, except that certain original hard plastic housings and other miscellaneous parts which are no longer available new, and only where those items are perfectly serviceable, are reused. Everything that can be replaced is new. New correctly color-coded wire, new wire harness casing, new wire terminals, new rubber boots…you get the idea. Our list of satisfied 914-owner customers is extensive, and these harnesses have helped keep the factory fuel injection on many 914 cars.

The research and development required to make these harnesses to the high quality that they are is extensive, including rigorous in-service testing. They may appear easy to make but do not be fooled into thinking you could do your own in a few hours, they are much more difficult than they appear. Over four years in development and testing, each FI harness takes most of a day to fabricate, even with all the correct parts, special tooling and experience on hand. You receive the benefit of all of these things at the lowest price possible and with quick delivery. Our replacement harnesses are configured identically to the original OEM factory wiring harnesses and are handcrafted to exacting standards using new, OEM or better quality components, without being overbuilt. New high-count multi-strand copper wiring with correct color coding and upsized wire gages is used with new OEM wire terminals and durable new harness casing. Original, serviceable, hard plastic parts are cleaned and reused because they are not generally available new. Our wiring harnesses feature extra-durable, new rubber boots (the finest-quality available), and casing reinforcements at critical wire terminals and internally to the harness, for long-lasting durability. Great care is taken in the workmanship of every harness, and each harness is comprehensively bench-tested during fabrication and again at completion. Each harness includes an electrical circuit diagnosis and installation diagram to make the installation of each harness a simple task.

Unsolicited responses from customers we have received since 2001:

“I received the harnesses to day. Absolutely incredible craftsmanship…I really appreciate it. Thanks for the diagrams as well.

I do some network cabling myself, so I really appreciate clean, professional work. – Craig K, Georgia

“Have to say the harnesses look mighty fine…great job and thanks for keeping the 914 alive!!” – Greg G, Massachusetts

“OMG!! We received the harnesses and are extremely pleased with the engineering quality and diligence!!”

“Jeff, you are an artist and skilled practitioner! Thank you for the time and effort!” – Darren C, Washington

“Jeff, I had to send you an email. The harness that you built is of the finest quality and craftsmanship. I took it

out of the package and I could not stop staring at it. Excellent in all aspects. Installing tonight!” – Steve T, Ohio

“Just installed the MPS. YOU DID IT! It's FIXED!. Fired right up. idles great. revs quick. No flat spot

and no bucking…it is definitely a 100% improvement. Thanks again for your great service.” – Gary C, California

“Top Shelf work and well worth the money” – Steve C, Missouri

“Beautiful work. The included literature is both clear and useful” – Jim Thorusen, California

“Jeff, I just wanted to drop you a note to say the harness you build for the 1973 1.7 that I am restoring is by far the best piece of

craftsmanship that I have seen in some time. Although I think your harness far exceeds the factories version, what I especially liked

are the dust boots. The fit is tight, snug and creates a very good seal. Thanks again” - Hayward S, Washington

“It looks like it should be on the Space Shuttle” – Steve S, California

“Jeff, You are a lifesaver! I had struggled with fuel injection issues for a year and I was at my wits end about what I could do to rectify those issues.

Once I installed the new FI harness all those problems went away and my 1.7L is back to being a car I love!

You provide a hugely valuable service for us that no one else I know of does. Thank you for that!” - Greg R, Colorado

“The build quality is excellent, the components are superior, the appearance is great” – Brad Anders, Arizona

“Better than OEM Factory…solved all of my problems” – Bob H, California

“You Rock..You Rock..You Rock..!!!” – Rex L, Colorado

“I have received the harnesses, thank you so very much for building it and assisting with the shipping. The quality

and the workmanship of the harnesses are flawless! I feel like wrapping it in clear plastic

just to keep it looking that good!” – Christopher G, South Africa

“Aloha Jeff, I've gotta tell you, those aren't harnesses you sent, they're works of art. By far, these are

the most beautifully-prepared and restored harnesses I've ever seen. I wish I could have received the

same quality of workmanship for the harnesses I've installed in other vehicle restorations. I can't wait to get these

installed, and have the car back on the road. Many mahalos” - Scott M, Hawaii

“I received the MPS yesterday and have to tell you: My car has never ran nicer!

It started right up, no stalling, and went on a small Christmas Eve road trip. I'm really psyched.

Great job and thanks again!” - Ron W, New Jersey

THANK YOU!

To our previous customers who have continued to inspire us in making these harnesses available for D-Jet and L-Jet car owners

Examples of the Wiring Harnesses We Build

See Availability and Pricing Chart Below

914/4 Porsche D-Jet Fuel Injection Harnesses

ECU to engine sensors, fuel injectors and relay board – Replacement boots

914/4 Porsche D-Jet Fuel Injection Harnesses

ECU to engine sensors, fuel injectors and relay board – Original D-Jet boots

914/4 Porsche L-Jet Fuel Injection Harnesses

ECU to engine sensors, fuel injectors and dual relay

914/4 Porsche Ignition Harnesses

Relay board to starter motor, back-up light switch, coil, oil pressure sender, aux air regulator…

For D-Jet and L-Jet cars

021.971.349D 914/4 Porsche Alternator Harness

Relay board to alternator, starter motor

Rebuilt Manifold Pressure Sensor (MPS)

For Porsche 914 1.7L and 2.0L D-Jet fuel injection

914.612.115.10 Rear Foglight Harness

For all Porsche 914 with foglights

914.612.143.10 914/4 Porsche Windshield Wiper Delay Harness

For 1972-76 914 Porsche only. Mounts to the front cowl support strut and

attaches to the brown/black stripe wire in the chassis harness under the cowl.

Replacement rubber boots comparison to Original D-Jet FI harness boots

(Extremely limited supply of Original boots - inquire about availability)

914.612.145.10 1973-76 Porsche 914 Oil Temperature Gauge sender cable

Throttle Position Sensor calibration plugs.

Verify the # of cavities on your TPS before ordering (4 or 5 cavity plug?)

We Build and Restore Other D-Jet and L-Jet Wiring Harnesses (Only by Special Order and Quote)

Fuel Injection and other engine bay harnesses for the Porsche 912E, VW, Volvo, Mercedes Benz, Peugeot, Renault, Cadillac

Wiring Harness Repairs and Restoration (By Quote)

At the present time there are a few wiring harnesses for 914's and other mostly German D-Jet/L-Jet cars that we may not rebuild,

but your wiring harness may be repairable. Whether your existing wiring harness needs significant repair (such as from an engine fire)

or only minor attention, please send your harness to us and request a free repair quote. Our service will put you back on the road. Email Me

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914/4 Porsche Master Wiring Harness Availability and Pricing Chart

All USA-market wiring harnesses originally produced are listed for reference – Pricing is only indicated for the harnesses we build

Note 1: Item includes printed diagram to assist with installation ad future troubleshooting. Diagrams also available for download from Reference Library below. Slight color variations in outer casing one section to the next may occur just like the original OEM harnesses – it adds character and a sense of originality. Rubber grommets for chassis or engine tin harness penetrations not included unless indicated. Reinstall your existing grommets.

Note 2: Core charge required where indicated. Applicable core charge is refundable to purchaser subject to our receipt, inspection and acceptance of your submitted core. One core refund per like item purchased.

MOST items are inventoried and available for prompt shipment

Money Back Guarantee and Limited Warranty

30-day money back guarantee, because we want you to be happy with your purchase.

90-day limited warranty against workmanship or material defects.

Guarantee - Warranty details

Shipping & Payment

We ship at reimbursed cost (no mark-up!) using USPS Priority Mail to all USA and Worldwide addresses.

U.S. funds only, credit cards only through PayPal, money orders, checks.

Contact me directly with any questions you may have or to place an order

Jeff Bowlsby

San Ramon, California

Email Me

Please contact me to tell me what items you want and your zip code, and I will respond with a full quote including shipping cost and payment details.

!!! See My Other 914 Porsche Websites !!!

914 Can Am cars

914 Classic

914 Parts For Sale

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Some of the Specialized Tooling & Equipment We Use

An inductance meter, fuel injection testers, hand tools and a break out box – these tools are indispensable for our work.

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914/4 Porsche NOS Wiring Harness Gallery

They are Art…because you don’t see these very often…

039.971.671 1973-74 2.0L GA engine code Fuel Injection Harness

039.971.761B 1975-76 2.0L GC engine code Fuel Injection Harness (49-state)

022.971.761Q 1975 1.8L EC engine code Fuel Injection Harness

311.971.761 VW Type 3 Fuel Injection Harness

914.612.007.13 1972-only 1.7L Ignition Harness

914.612.007.15 1973-76 1.7L, 2.0L Ignition Harness

914.612.016.16 1974 1.8L Ignition Harness

914.612.132.12 1970-73 Wiring harness for emergency light switch brake (2-pole)

914.612.049.16 1974-76 Additional Cables for Emergency Light Switch Brake (1-pole)

914.612.052.10 1973 2.0L Switch High Beam Headlight

914.612.053.10 1974-76 Wiring harness for radio, Blaupunkt (No. 21)

914.612.054.10 Wiring harness for radio, Blaupunkt (GT40)

914.612.056.10 1975-76 Additional cables for rear window heating

914.612.121.10 Wiring harness for radio, Becker

914.612.155.10 1973-76 Cable from center console to dash combo gauge, w/o center console

914.613.911.10 1970-71 Horn ground wire

915.612.057.10 1974-76 Wiring harness switch for fog tail lamp and rear foglight

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914/4 Porsche Original Wiring Harness Gallery

Original wiring harnesses for visual identification reference

914.612.151.10 1973-76 Center console gauge harness

914.612.143.10 1972-76 Wiper delay relay harness

914.612.085.00 1975-76 Rear License Plate Lights harness

914.606.101.00 1973-only Temp Sensor 2 ballast resistor – 270 ohms

039.905.351 1975-76 2.0L Solid State Speed Limiter Circuit

This circuit plugs into the FI harness of a 1975-76 2.0L California-only model 914s near the battery

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914/4 Porsche 914/4 Wiring Harness Diagrams - Reference Library

for troubleshooting your own harnesses

914/4 Porsche Wiring Harness ID Guide - DRAFT

D-Jet Fuel Injection Harnesses

1970 Porsche 914 1.7L W code engine

1971-72 Porsche 914 1.7L W code engine

1972-73 Porsche 914 1.7L EA/EB code engine

1973-74 Porsche 914 2.0L GA code engine

1975-76 Porsche 914 2.0L GC code engine (without speed limiter)

1975-76 Porsche 914 2.0L GC code engine/SL (with speed limiter)

1968-69 Volkswagen Type 3 - Manual Transmission

1968-69 Volkswagen Type 3 – Auto Transmission

1971-72 Volkswagen Type 3

1973 Volkswagen 412

1974 Volkswagen 412

1973 Mercedes Benz 450SL

1973 Mercedes Benz 450SLC

1974 Mercedes Benz 450SLC

D-Jet Ignition Harnesses

1970-71 Porsche 914 1.7L

1972 Porsche 914 1.7L

1973-76 Porsche 914 1.7L/2.0L

L-Jet Fuel Injection Harnesses

1974 Porsche 914 1.8L

1975 Porsche 914 1.8L

1976 Porsche 912E 2.0L

L-Jet Ignition Harness

1974-75 Porsche 914 1.8L

Porsche 914/4

Alternator Harness

Dash Switch Diagrams

Wiper Delay Harness

Rear Window Defroster Harness