So I replaced the relay board as well as the 14 pin connector and the engine started right up. I shut it down to lower the lift and reinstall the air cleaner assembly. Back in the car and it fails to start! The fuel pump is working but no crank. The previous owner installed a “hot start” relay next to the starter. I’m getting 12.4v to the starter and the relay but no action. All connections are solid. I’m thinking ignition switch. Any other suggestions?
In the course of working through these issues, I’ve had to replace several connectors as the wire is “worn” when it has had a chance to flex and bend. Pretty sure I’m going to replace the entire harness when I rebuild the engine next spring. Getting a little tired of chasing down these little issues over and over again. 52 year old harness, AAARRRGGGHHH!
Failure to start
I went on to replace several wires in the engine compartment that were of questionable quality. I also replace the battery cables with 2ga marine grade cables (after extracting the old battery cable, I was almost unable to straighten it). As everyone else has observed, I found that the ignition switch was cracked when I replaced it. At the end of the diagnosis tree, it turned out that the problem was the starter itself (probably the attached solenoid). The failed unit was a rebuilt Bosch. It had apparently been on the car for years as evidenced by the condition of the gear teeth. I replaced it with a WOS geared starter. Very nice unit.
Now I want to remove the "hot start" relay that the PO installed. Can someone post either a diagram or photo of the original starter wiring? Thanks
Now I want to remove the "hot start" relay that the PO installed. Can someone post either a diagram or photo of the original starter wiring? Thanks
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Bill Blodgett
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To what model Porsche does this pertain ?