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Old 02-20-2012, 12:45 PM   #1

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Tire Pressure and Voltage Regulator

Two questions...what should 31x10.5 on 15x8 rims be inflated to? I'm guessing high 20s....

...and has anyone had their voltage gauge peg at the high end? It will reset itself sometimes but always when the ignition is turned off and back on. Not sure if the ever-so-slight oil leak that's lined up perfectly with the hot lead on the starter has anything to do with it...


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Old 03-05-2012, 04:04 AM   #2

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So I hooked a volt meter up via the 12v aux outlet (aka cigarette lighter) and when the gauge in the dash pegged high, the volt meter read a constant 14v. Anyone ever have the dash gauge go bad? Anything easier than pulling the dash to replace a faulty gauge?

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Old 03-05-2012, 04:56 AM   #3
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No idea on the voltage question...but I ran my 31's around 28-29 psi mostly I think.
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Old 03-05-2012, 10:40 AM   #4
Knows a couple things...

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For the high voltage reading on your instrument cluster, that could be nothing more than a loose/dirty/corroded connection at the battery. The alternator requires an accurate charge indication from the battery and it can only get that if the battery connections are clean and tight. A bad battery connection can cause the alternator to think the battery is not charged which can cause it to keep upping its voltage output.

Don't just look at the battery connections and pronounce them as good. Bad battery connections can look fine. Physically remove both connectors and wire brush both the battery posts and the connectors themselves, then reinstall and get them good and tight. Once the connector nuts are tight, see if you can move the connectors around the battery posts with your hand which indicates a worn connector which there is a simple fix for.
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Old 03-15-2012, 04:48 PM   #5

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Thanks guys, it seems to have been the negative connection on the battery. Little loose and I couldn't tighten it. So I turned it upside down and got some spread on the terminal connector. The only way to describe is that it "cupped" around the post.

Anyway, thanks WF and its awesome members.
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