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Davidf · 10-14-2015, 02:15 PM

The heavy gauge orange wire connects to the terminal labeled "CIG".

Also, I recently discovered (service bulletin) that the brown (field) wire at the voltage regulator should have a blocking diode installed to prevent the anti-dieseling relaying from being damage. GM says this should be used in addition to the updated anti-dieseling relay 6273301 that has a blocking diode built it. Apparently, early trucks/relays did not have either diode and the result was power feedback that damage the relay and caused constant 12v to the a/c compressor clutch thereby resulting in a drained battery.

10-14-2015, 02:15 PM	#14
Davidf Registered User Join Date: Nov 2014 Location: Austin Posts: 749	Re: 71 Cheyenne AC Help The heavy gauge orange wire connects to the terminal labeled "CIG". Also, I recently discovered (service bulletin) that the brown (field) wire at the voltage regulator should have a blocking diode installed to prevent the anti-dieseling relaying from being damage. GM says this should be used in addition to the updated anti-dieseling relay 6273301 that has a blocking diode built it. Apparently, early trucks/relays did not have either diode and the result was power feedback that damage the relay and caused constant 12v to the a/c compressor clutch thereby resulting in a drained battery. Last edited by Davidf; 10-14-2015 at 02:27 PM.