Problem with my 94' Chevy Suburban. ?

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Vice Hunter

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Okay so here is the deal, my wife went to drive her Suburban after it sat for two(2) days. When she went to start it the battery was completely dead. I put it on a charger over night and it started up. Well on her way to work after sitting for another day her battery light was on, service engine light was on, oil pressure was really low, as in the red, the speedometer was jumping and was not shifting properly (automatic). After about 10 minutes of driving on the highway she said everything jumped back up to normal. Looking for ideas, the battery tested good about 3 months ago and I will have it tested again tomorrow. Thanks for the help in advance!
 
Diode trio may be bad but could be a defective ground but get it tested before you fry the computer.
 
I would say you have a problem in a wiring harness some where. A bad alternator wouldn't cause a lot of things you say are happening. The first thing everyone says is it's a bad alternator.
 
You can test the alternator to see if there's a problem with it.

http://www3.telus.net/chemelec/Projects/Alternator/Alternator.htm

Look for the part that says "One Very Simple Alternator Test"
 
I would strongly recommend a battery / alternator test. The only common denominator between all three listed symptoms is voltage. Low oil pressure will set a check engine light, and poor idle quality due to low voltage can cause low oil pressure. As for the battery light, this will come on any time your battery or charging system drops below 12 volts. possible causes are 1) weak battery, or 2) faulty voltage regulator in alternator.
Hope this helps!!!!
JAMES
 
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