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Electrical issue

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New User

Mar 17, 2012, 2:11 PM

Post #1 of 5 (726 views)
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Grand Cherikee Larado

2004 jeep will not stay running. Gages go nuts when i hit the key on. Benched checked the alturnator. It's OK. battery show's that it needs replacing however, i think there is somthing else going on. With the battery disconnected i can start and iddle it above 1000RPM. Whe the idle is under 1000RPM, the car dies and the gages go crazy. Help

Tom Greenleaf
Ultimate Carjunky / Moderator

Mar 17, 2012, 2:18 PM

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Long retired now
New User

Mar 17, 2012, 2:21 PM

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So what is the next move?

Tom Greenleaf
Ultimate Carjunky / Moderator

Mar 17, 2012, 3:21 PM

Post #4 of 5 (693 views)
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Ok - you need to have a known good battery as a beginning as if the thing is stressing out the alternator no telling what troubles there too.

Alternator may be regulated by computer control not inside it by a voltage regulator so you need to know if it can put out any reasonable voltage on vehicle. It may be killing you battery or running such low voltage that things will just misbehave.

Figure on 12.2 when charged by charger is about right and engine running about 13.5 to 14.5v and if it can't do that AND not just some wiring not working or broken that will have to be addressed on its own and hope you don't need of ton of possible controls for everything if it has spiked voltage somehow?

A whole host of things are on the maybe list but begin with a known good and charged battery then the voltage output at least for now,

Then if it will behave it probably will need codes read. Hard codes will come right back. Marginal ones may take some running of the thing to show up,

Long retired now

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Mar 17, 2012, 5:56 PM

Post #5 of 5 (668 views)
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With the battery disconnected i can start and iddle it above 1000RPM.

How can you start the engine with the battery disconnected? Does this have a pull start?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

Electrical issue

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