Voltage problems, cutting out when hot

Fans are completely removed from charging/wiring

Something is haywire. You are talking about unplugging the switch and reading voltage. You are getting this on the bulkhead end of the harness and not the connector on the ignition switch end? That wire should be dead

But further, may not tell you anything to probe with various harness parts disconnected.

"Let's say" you have a poor contact in the ignition switch or in the switch connector in the "run" circuit, example.

If you read that voltage at the switch connector, everything connected normally, the CURRENT DRAW of the loads connected to it will cause a low reading and alert you.

But if you take the same reading with the loads/ connector unhooked, it may well read "normal."

If you have the switch disconnected........and are reading the connector half that leads to the bulkhead.......and if you showing voltage on either the yellow start wire or the blue run wire...........something is feeding back there someplace, possibly the fans??


At the ignition switch wiring plug going to the bulkhead the yellow wire reads-
image.jpg

So I’m now I’m going to throw a monkey wrench into the entire process.
I hadn’t given this too much thought because I was assuming I had it bypassed as shown in another forum.

This car has the dreaded 1974 seatbelt safety system... there is a box under the hood and another (green) under the dashboard.

The yellow wire at the starter relay reads 11.x unplugged with the ignition switch unplugged as does the brown wire (neutral safety switch) image.jpg