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post #1 of (permalink) Old 12-21-1999, 02:04 AM
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High Volts and oil pressure

The Volt gauge on my dash the neddle maxes out most of the time. Can high volts do damage to anything, or should I look into it further? And my oil pressure reads higher than it can go most of the time also. Are these problems I need to fix? or are they no big deal, any ideas?


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post #2 of (permalink) Old 12-21-1999, 04:51 AM
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Re: High Volts and oil pressure

[img]/wwwthreads_images/icons/tongue.gif[/img] The little red flag that pops up in this question that you have about high volts, Jason is that high voltage will also affect the way the oil pressure gauge reads too. This sounds like the alternator is not working right to control the volts, and it may have a bad wire on the outside, OR an internal regulator problem. It certainly would be a good idea to run some tests on that puppy before the battery is ruined.[img]/wwwthreads_images/icons/crazy.gif[/img]

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post #3 of (permalink) Old 12-21-1999, 06:26 AM
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Re: High Volts and oil pressure

couldnt that little dash mounted voltage regulator cause this?

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post #4 of (permalink) Old 12-21-1999, 05:50 PM
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Re: High Volts and oil pressure

I will test the electrical part myself, if there is a way. I will look in my Jeep Book, or take it to NAPA or some other parts store, I am pretty sure they can test the alternator.

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post #5 of (permalink) Old 12-21-1999, 07:56 PM
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Re: High Volts and oil pressure

I have a 78 CJ7 that had the same problem. After a couple hundred spent on a new battery, alternator, v-reg, rewiring, oil pressure sending unit, etc, there were no changes in my readings. These readings were identical to yours - excessively high volts and oil pressure. However, at times my oil pressure was not registering at all. Finally, I put in some new Auto-Meter guages and bang - my problems were solved. The guages themselves were bad. However, take the advice of the previous poster - test them BEFORE you buy.

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post #6 of (permalink) Old 12-22-1999, 11:02 AM
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Re: High Volts and oil pressure

In my humble opinion,
Your alternator voltage regulator is junk. You didn't say if you have the internally regulated delco alt. or the externally regulated mopar or ford types. I have seen all types do this very thing. I just fixed my sister's ford truck this week with the same problem. Gauges will go up or max out, but 'idiot' lights will never come on. The crucial test is... do the gauges move together? The volt meter goes up, and the other gauges go up too?
If they don't, it is something else.

Testing yourself is a real pain! Most of the time it is caused by a bad Alternator ground that kills the regulator, and it is normally an intermittent problem making it hard to diagnose.

How many of you actually have a dedicated alternator ground wire bolted to the back of the ALTERNATOR, (not the bracket) and using star washers to get a good bite? Wire at least 10 Ga., and should be a 4 Ga., and run back to the battery?
Battery ground wires should be at least 2 Ga., and run to a starter bolt with a star washer.
Your alternator ground wire can also be the ground the engine, but the body and frame need solid grounds also.

Chances are your gages are damaged by now if the voltage exceeded 18 volts. Your engine temp gage and your oil pressure gage should always be mechanical anyway. I am a BIG fan of Autometer gauges, and you can keep your second set under the hood
(old racers trick), or in a hood scoop or cowl scoop.
If a gauge reads stupid, or an idiot light comes on, you can raise the hood and get a second opinion real quick. Mechanical gauges work even if the electrical system gets yanked out of the vehicle, and you have to limp home with just the distributor wired to the battery. (Been there... it wasn't pretty)
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