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Hello Will,

Here is a diagram of the wiring for the Perkins 4108:

In addition, click HERE to go to a website that has more information of the wiring harness for the Perkins 4108. The following is some of the information from that web page:

Perkins 4108 Diesel Engine Wiring Harness and Diagram

The front face of the original Perkins 4108 control panel,which is fitted with VDO gauges,oil pressure,rev, counter and water temperature,charge warning light,I have added an instrument light on/off switch and a remote cockpit 12volt supply plug.

My own boats engine is a tried and trusted Perkins 4108 diesel engine,its done around 1750 hours,which is not a lot for an engine around 25 years old? I service it on a regular basis and alway use the correct grade of diesel engine oil,this in itself doubles the permisable hours you can run between service over conventional oils.

My engine has what I think is the standard switch panel and related meters,the start switch had been changed for a non marine quality one,I put a new switch in,which in my case has the optional key position to warm up the Lucas fuel pre heater device used for cold starting.

The wire loom is original,it has two cable bullet connectors at each end of the loom,which in my case is about five meters long ( 197 inches) my connector blocks show some degrade from its previous service life,the 4mm brown live supply connector has corroded right away,requiring a reconnection.I also find a few stray wires that seem to connect to nothing,plus wires that are in the loom and are not required.

You can go to the website above to read more.

Hope this helps.

All the best,

Captain Ian Fagg

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Hi Will,

Don't know if this will help, but here is a link to a wiring diagram for the Perkins 4-108. Click HERE

I also have the shop manual for the Perkins 4-108 and I looked through it and you're right - - no detail on the wiring harness.

Sorry I couldn't be of more help.

Best,

Captain Mike Clayton