Question about 2004 Jeep Grand Cherokee

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I been having an intermittent problem with the voltage in my 2004 Grand Cherokee Limited showing low voltage on the gauge 9 volts and not starting. Have new battery 3rd one (Optima) in 2 years, yesterday started fine then I turned it off and when I went to start again only showed 9 volts and would not start of course. When I have boosted it in the past I have noticed the gauge only registering 9 volts then all of a sudden jump to 12+ volts and the able to start. I have had AVR tests which did not determine anything, battery tests at 12 volts. Could this be a voltage regulator problem and where is it?

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  • bertmaclean Jan 02, 2011

    Thank you for your response, checking with a volt meter was undertaken again last week (AVR test month before with no issues) at a shop just as you prescribe, the voltage was 12.8-13volts. Yesterday I put charger on with boost and gauge went over 14 volts and only got a "click" when attempting to start. Also tried boosting with dual batteries gauge only show 10volts and again just a "click". This is an intermittent issue once I have gotten it to start and take it to shop everything is fine for about a week, then issue starts again.

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When the engine is running, and a volt meter is placed on the battery, what is the voltage reading? This is the first basic step to check the alternator output. Do not rely on the gauge, use a volt meter.
Also rev the engine to approx. 2500 - 3000 RPM, what is this reading?
With the engine running, again, place a volt meter on the battery, turn on all the accessories, lights,blinkers, heater motor. etc. What is the reading when all these accessories turned on?

Posted on Jan 01, 2011

  • GetMeOttaHere Jan 02, 2011

    Perhaps this issue is related to a defective starter relay located in the PDC?

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