Quote:
Originally Posted by rnln
For me, and many other people on this board, it was the famous "yellow wire" from ignition key to the starter. It ran along the left hand side in the engine bay (it it's the same as 911). Voltage on this wire show only 7-8 volts during the problem, and usually when the engine gets hot. Normally, it should have around 12v. I tested multiple times by running a separate wire from the ignition end to the engine bay end of it. Started like a charm everytime it happend.
If you search on "yellow wire", you see a ton of info.
note: I replaced the starter, problem went away for several months and came right back.
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+1. For me the voltage drop was on the connectors on either the 14-pin engine bay plug (which was really ugly-looking) or the bulkhead connector from the ignition switch to the harness. Figured this out when my intermittent fault became solid - and pretty much everything else (ground straps, starter, ignition switch) had already been done. Disturbing the original ignition switch connector for a new one made my problem go away for a few months too - but the original has been in the daily driver for the last two years, nothing wrong with it...
At least look at the connectors. If they look oxidized, clean the pins/sockets with fine wet'n'dry paper, tweak tighter with long-nose pliers or spread the pins slightly with a screwdriver, re-connect.