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Making an ‘engine only’ harness from your Subaru harness involves removing all the other circuits such as lighting, wipers, heater, etc to leave just what is needed to run the engine. The entire engine circuit is left as Subaru intended in all harnesses converted bu RJES, so converted harnesses have the following features:
- All new conduit fitted
- A new fuse box is fitted, with all fuses sized as Subaru intended
- All Subaru check mode and diagnostic connectors are retained
- A new engine check light is fitted (for reading error codes)
- The Subaru ECU is used to switch the radiator fan rather than a temperature switch (the ECU’s use more than just coolant temperature to determine whether the fan ought to be on)
- The fuel pump is ECU switched to maintain the factory fitted safety cut off
- Fitting instructions included, including an explanation of what each wire that you need to connect does. The instructions are customised to suit your specific harness if required.
We pride ourselves on the standard of our wiring work. The objective is to end up with an near OEM quality wiring harness for youe Subaru conversion. Quality automotive wiring components will be used throughout, with non of the wiring bodges often seen on engine conversions (even on some professionally done ones), such as mismatched wire sizes, pieces of domestic mains wire, so called ‘pre insulated’ single crimp connectors, Scotchlok connectors, terminal block, etc..
All required Subaru harness features will be retained. Outputs will be modified to interface with the VW instruments if required. Any non required features (typically other circuits which interfaced with the engine ECU in the Subaru) will be insulated and identified in the harness near the ECU, and hidden in the conduit, just in case they should ever be needed.
Harness as Removed from the Subaru:
....and as Converted to an RJES Subaru Engine Harness (note - the on in the pic is not the same one as above)
OEM quality automotive components are used throughout, including matching rating thin wall insulated wire, ‘double crimp’ connectors, new blade fuse box, new conduit, soldered joins between all cut wires:
Wiring Harness Features Check List:
If you are shopping around considering using another supplier to carry out your wiring harness conversion work, you may want to check that what you will get back includes the following:
- The engine check light
- Diagnostic connectors
- The cold start circuit
- An output to drive the VW coolant temperature gauge if for a T25
- ECU controlled radiator fans are nice to have too, as Subaru's use more than just coolant temperature to determine when the fan should be on.
Don't accept that any of the above 'can't be kept' in a VW conversion, etc as an answer, as this is simply not correct. There are definitely people out there doing harness work in the UK and telling customers this, and the only possible explanation can be that they don't understand enough about how the Subaru circuits work, and have a ‘cut off everything we don’t understand’ attitude. All of the above can be retained in any VW conversion using any Subaru engine, and the first three definitely should be. Without them the job has not been done correctly. All of the above are retained in all harnesses converted by RJES.
Unfortunately the standard of work on Subaru wiring harnesses for VW's is not all equal, and we have fixed, or helped the owners to fix quite a number of converted VW’s which had some or all of the above features missing....
Harness Conversion Work Cost Calculator
Filling in the table below will give you a price for converting a Subaru harness based on ot’s specification:
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