Quote:
Originally Posted by Jeremy5848
In my 603, near the brake booster, there's the idle speed select plug and another three-pin plug and socket with a heavy violet/white wire to the center terminal. I shall have to examine the schematic in more detail.
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Here's a photo of the test cable I was referring to. It is designed to be used with the fancy factory compression tester, but it can be rigged to work with a home-made button so you can crank the engine without using the key. For the +12v feed you run a wire to a clip that attaches to the battery terminal. Here's the procedure, with more info, from the factory service manual (250k PDF file) :
http://www.w124performance.com/service/OM602_603_Print/01-010.pdf
