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Originally Posted by 406cid70Chevy
With the engine on it's at 12.6 volts. Shouldn't it be at about 14.2 volts when the engine is running?
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Yup
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Are there any tests I can perform to determine if it's the alternator, voltage regulator, or another source?
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If you know how to energize the field on your alternator, you can eliminate the regulator to determine if it's bad. Otherwise you could just bring the alternator into an auto parts store and have it tested.
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Could bad grounds cause this? Thanks!
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Check that your regulator is well grounded to the core support. The alternator is grounded directly to the block through the mounting bracket, and your battery ground cable should also be direct to the block. The block should also be grounded to the firewall.