72 C10 charging system - The 1947 - Present Chevrolet & GMC Truck Message Board Network

planewhisperer · 12-29-2010, 04:27 PM

Hello everyone, My son has a 72 C10 and having alittle problem with charging system. System has external voltage regulator. With truck running I only have 12.34 volts approx at the battery terminals. Does anyone know what the voltage should be from the alternator blue and white connector on the alternator. Does anyone know how the direction of current ie battery, alternator and external voltage regulator.

Shyguy · 12-29-2010, 05:23 PM

Voltage at battery with the engine running should be 13.5-14.5 volts, I think.

12-29-2010, 04:27 PM	#1
planewhisperer U.S. Army Green Beret Sniper Join Date: Dec 2009 Location: Enterprise Alabama Posts: 57	72 C10 charging system Hello everyone, My son has a 72 C10 and having alittle problem with charging system. System has external voltage regulator. With truck running I only have 12.34 volts approx at the battery terminals. Does anyone know what the voltage should be from the alternator blue and white connector on the alternator. Does anyone know how the direction of current ie battery, alternator and external voltage regulator. __________________ "YOU CAN RUN AND YOU CAN HIDE, BUT YOU WILL JUST DIE TIRED"

12-29-2010, 05:23 PM	#2
Shyguy Junior Member Join Date: Dec 2006 Location: Southeast Missouri Posts: 2,436	Re: 72 C10 charging system Voltage at battery with the engine running should be 13.5-14.5 volts, I think. __________________ '67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E.



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