High voltage

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laidbackbigun

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Issue im having is the stock gauge in cluster is reading 18 volts tripping the battery light when ibput a voltmeter on it says 14.1 my aftermarket gauge says 14.1

Now i tried a different cluster and same thing. Anyone know what it might be its a 1995 5.7 tahoe with tbi
 

east302

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Where is the tap for your aftermarket gauge?

The cluster voltage gauge just reads battery voltage from the Gauges fuse. It looks like the battery light is also fed from that, but is only grounded when the alternator sees an out of spec voltage.

How that process happens, I don’t know, but check the actual cluster voltage at the Gauges fuse and see if it matches the gauge needle.

If it isn’t matching, I’d really suspect a cluster issue...even though you’ve already tried swapping it out.

If the gauge needle was normal and the battery light kept coming on, I’d think it was an issue with the regulator somehow incorrectly grounding that circuit.

If the gauge is correct and truly seeing a spike, then I’d look at the voltage regulator as well.

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laidbackbigun

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So a weird interewting bit of info. The alternator went out before i could test. Just dead so i install a unit from autozone and now my stock gauge reads same as aftermarket. About 14.1 unloaded. Can someone explain why this alt is charging normal on both gauges and old alt only charged proper on aftermarkt
 
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