Question about 2007 Jeep Wrangler Unlimited Rubicon 2 Doors

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2007 Jeep Wrangler Alternator/computer issuses?

I have added a snowplow to a 2007 Jeep Wrangler and the radio goes out/battery light comes on. If you use it for a little longer the dash lights flash and it goes into a survial mode.
The plow is brand new checks out at pulling 100 amps.
I have added a 950 cca battery.
I replaced the alternator which is 160 amps.
Should not be any problems.
When checking the amps coming from the altenator it only produces 95 amps. The Jeep dealer tells me that the computer regulates what it will produce and that they can not reprogram the computer?
Any suggestions?

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  • moonpear Jan 23, 2009

    I'll be interested in solution, as I have similar problem.

    Do you know what fuse# the controller is connected to?

    I added 2-0 ground from battery to block, and that did not help either.

  • mmccurdy May 11, 2010

    Is this during normal plow operation, or only when raising lowering via an electric motor?

    Where did you attach the electrical connections for the plow mechanism?

  • Frank
    Frank May 11, 2010

    is not they can't reprogram the computer, is that they don't know how or they don't have the equipement.

    the equipment to reprogram the computer is about $1,000-$2,000 and not many people know how either.

    I can't suggest anything here either. Since I don't have the equipment.

    do a search on the Internet for "reprograming ECU"



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I too have a 2007 Jeep Wrangler Unlimited Rubicon and yes the stock battery is too weak to handle large electrical accessories like hydraulic pumps and winches.
While the stock 160 amp alternator 'can' make 160 amps, it idles at about 100 amps. For most applications this is fine.
Giving the engine a little more throttle and holding at 2000rpm should help. Optima batteries are not as good as they used to be, I recently replaced my Optima with Sears Die-Hard Marine Gel.
While a 2nd battery may increase the length of time until drained, it may not be sufficient to plow a mall parking lot etc. street plowing should be ok because you will normally rev over 2000rpm.
For a stationary winch pull I have used a Hyper-Tech ODB2 computer to temporarily raise the idle from 600rpm to 1500rpm. However this May not work I'm your plowing operation.
I installed a Mean Green Alternator producing 210amps just above 1000rpm. It has worked much better for winching and off-road lights. Cost: about $375 at Quadratec.

Posted on Nov 10, 2013

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So, How did you end up fixing this problem????? I have same issue. Please post resolution. Thanks.

Posted on Dec 11, 2009

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Add a second battery

Posted on Oct 03, 2009

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