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Topic: 1968 C2 Bad Voltage Regulator

in Forum: C3 Electrical

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1968 C2 Bad Voltage Regulator (1/3)
9/11/20 5:51pm

fivejah
Former Member
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Auburn, WA - USA

Vette(s):
1968 Corvette 454ci 4 speed

Joined: 8/8/2020
Posts: 7

My 1968 C3's battery will not hold a charge. Battery is new and alternator checks out good. Could it possibly be a bad voltage regulator? Gauge shows that it is not charging.

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Re: 1968 C2 Bad Voltage Regulator (2/3)
9/11/20 9:23pm

73shark
Limited Member
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Overland Park, KS - USA

Vette(s):
1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.

Joined: 7/9/2003
Posts: 866

What voltage is the alternator putting out with the engine running? If the battery is not fully charged, it should be putting out 14+ volts.

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1973 L-82 4 spd

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Re: 1968 C2 Bad Voltage Regulator (3/3)
9/12/20 9:21am

manchestershark

Lifetime Member
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Equinunk, PA - USA

Vette(s):
1972 conv, 4-speed, 350, 200hp, numbers match, rally wheels, war bonnett yellow w/white top. good condition, nice driver.

Joined: 10/31/2007
Posts: 2387

Sounds like a bad diode. Charging, but draining back through the alternator. Charge the battery to 14.2, then disconnect it. If it holds while disconnected, you have a drain in the system.

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