14 volys at batt and alternator, guage says 12 volts??? - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

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post #1 of 4 (permalink) Old Jul 21st, 03, 04:23 AM Thread Starter
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Location: Newark, Ohio
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So I was doing some trouble shooting this weekend on my electrical system and i am lost. I was told to measure the volts at the battery and the alternator with car running and all my lights and fan on and see what the volts say. I have been having a problem with the volts dropping down past 12 volts. So I tested and I get 13.9 volts at the battery, 13.9 volts at the alternator and 13.9-14 at the horn relay with everything on. the guage in dash stills reads 12 volts and sometimes flucuates lower and higher. What the hell? I don't know where to look next. Everything is brnad new too. Any more suggestions? I also ran the 8 guage wire direct from the battery to the alternator and now when I taop the brakes the volts drop.

67 Camaro Pro Street, 540 Bill Mitchell Merlin big block, Merlin Aluminum heads, Holley 870, hydraulic camshaft, 2" Hooker Super Comp headers, Mallory and Crane ignition system, TH400, 2600 stahl, Ford 9" w/ 4:10 gears and posi.
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post #2 of 4 (permalink) Old Jul 21st, 03, 06:21 AM
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Check the ground your gauge is using??

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post #3 of 4 (permalink) Old Jul 21st, 03, 10:00 AM
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When you are doing your tests what you measure on the fuseblock BAT and IGN terminal? I assume that this is an aftermarket gage wired on the IGN side of the switch. If BAT looks good it’s not a ground issue. If BAT doesn’t look good it may be the forward lamp harness positive lead connection on the horn relay or a ground.
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post #4 of 4 (permalink) Old Jul 21st, 03, 11:08 AM
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Guage could be out of calibration also. Do the voltage checks as others have suggested. Best of all is to measure the voltage between the + - leads of the guage (wherever they may be connected). Many of the guages have a calibration pot inside the lamp socket. Just don't tweak it without checking though. If you do have an electrical system problem, a miscalibrated guage won't be of much use.


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