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Old 01-13-2018, 09:22 PM   #14
ray_mcavoy
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Join Date: Nov 2009
Location: Sherman, ME
Posts: 2,358
Re: 66 C10 Engine Wire Harness w/ Gauges and HEI

Yes, the pink wire in the dash harness should be providing battery voltage to the ignition in both the "start" and "run" positions. And the connection / routing of that pink wire should be the same for both warning light & gauge style harnesses.

The yellow wire down to the solenoid "R" terminal will only provide power to the ignition when the solenoid is engaged to crank the engine. It switches back off once you stop cranking the engine.

Since your engine only wants to run while the starter is engaged (or with a jumper wire directly from the battery to HEI), it sounds like there is an issue with the pink wire not providing power to the ignition. That could be due to a bad connection or defective contact inside the ignition switch.

Try connecting a test light or voltmeter to the pink wire at the back of the ignition switch. It should have battery voltage when the key is turned to the "on / run" position. If it does, try testing again on the pink wire that goes into the firewall bulkhead connector. Then again on the engine side of that connector. Working your way along the circuit, testing for voltage at the various points should allow you to pinpoint the trouble spot.
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