My TJ won't run unless it's jumped and dies as soon as you take off the jumper cables. I was told the voltage regulator is in the computer. So do I need to get a new computer???? Or is there another fix????
Also, if the battery is weak, bad or the voltage is off, the computer will shut the vehicle right off. It is common in Chrysler products. I had this with my Jeep, my Durango as well as other on forums. Have the battery tested.
2003 TJ, 33" BFG AT, 2" BL, 2" BDS spring lift, Truck Lite headlights, Homemade sunrider top.
Will it crank, but not turn over or is there nothing but a click (and possibly what appears to be possessed guages, tach and speedo jumping around). If so then it is probably your battery. Have your battery tested or borrow one from another vehicle to test if that is your problem. Check your cables and connections. Clean them with a wire brush to remove any and all corrosion. Make sure that the connections are tight as in once they are connected they cannot be moved at all. Before you start replacing parts, check the easiest and cheapest first.
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If the gauges are going wild - jumping up and down, it means you have low voltage to the system.
- try jumpering it from another GOOD battery with GOOD jumper cables.
If still no go - your battery may be dragging it down if it's internally shorted.
Disconnect your battery - clip the jumper cables from the other battery to the cables. If it still makes no difference it's not the battery.
Next check the connections on BOTH cables at BOTH ends. Feel along the cables for any signs of swelling - sometimes a cable will corrode under the insulation - it usually swells a little there.
Try using the jumper cable to run from the (-) post of your battery to engine ground - that checks the (-) cable.
Try jumpering between your (+) post to the starter with the jumper cable. That checks the + cable.
Look at the connections in the relay box at the firewall end where the battery cable brings power into the box.
Your battery simply isn't able to supply enough current to the system - bad battery or resistance somewhere. It's not your alternator - alternator is not used for starting.
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