Voltage dropping
#1
Voltage dropping
My voltage is acting weird. The truck was down for about two weeks waiting on the pump to get resealed. when I got it running again the voltage drops to around 12 when I idle and comes back up to around 14 with throttle. The truck has a voltage regulator and a new alternator. The truck is a 1991.5
#4
Administrator
How old is the battery?...Mark
#5
Administrator
If the voltage is dropping to 12, it could be that that is the battery voltage, try checking battery with truck off. It should be near 13 volts or so. If it is good, it could be dropping under load and still be bad. Try turning on the headlights with the engine off and see how far it drops, it shouldn't be too much...Mark
#7
Administrator
But, when you start it and idle it, it drops to 12v? I see that it is a 91.5, that is intercooled, right? I would check all the grounds and connections and then hope that JMartin chimes in, he knows a lot more about pcm equipped trucks than I do...Mark
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