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Unread 06-07-2013, 02:46 PM   #1
1999CherokeeXJ
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Join Date: Jul 2012
Location: Granby, CT
Posts: 2
1999 XJ Electrical Problems (Blinker,Voltage Meter,Radio)

Hi Guys,

I have a 99XJ and I've been having electrical problems for a while. In the past couple days, my radio stopped working (aftermarket head unit continuously flashing on and off), then my turn signals stopped working (they would work for a couple seconds before turning off, now they wont at all), and now my voltage meter drops to 0 shortly after turning on.

Has anyone else experienced similar problems? Does this sounds like faulty grounds?

Thank you in advance.

-Scott

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Unread 06-07-2013, 05:15 PM   #2
CJ7-Tim
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2000 XJ Cherokee 
 
Join Date: Apr 2002
Location: out in the garage - Minneapolis, Minnesota
Posts: 22,080
Sounds like a low voltage issue from:
  • a failing battery
  • a failing alternator
  • dirty, corroded, or loose wire connections
  • internally corroded battery wires
Perform routine maintenance of the start and charge systems. Remove, clean, andfirmly reconnect all the wires and cables to the battery, starter, andalternator. Look for corroded or damaged cables or connectors and replace asneeded. Copper wires should be copper color, not black or green. Do the same for thegrounding wires from the starter to engine block, and from the battery andengine to the Jeep's frame/body. You must remove, scrape, and clean untilshiny, the cable/wire ends, and whatever they bolt to. Jeeps do not toleratelow voltage, bad connections, or poor grounds.


Place your DVOM (DigitalVolt Ohm Multi-Meter) on the 20 volt scale. First check battery voltage byplacing your multi-meter's positive lead on the battery's positive post ( theactual post, not the clamp) and the negative lead on the negative post. Youneed a minimum of 12 volts to continue testing. Next, leave your meterconnected and take a reading while the engine is cranking. Record this voltagereading. Now connect your positive lead to the battery terminal stud on thestarter and the negative lead to the starter housing. Again, crank the engineand record the voltage reading. If the voltage reading at the starter is notwithin 1 volt of battery voltage then you have excessive voltage drop in thestarter circuit.

Typical voltagedrop maximums:

• starter circuit (including startersolenoid) = 0.60 volt

• battery post to battery terminal end =zero volts

• battery main cable (measured end to end)0.20 volt

• starter solenoid = 0.20 volt

• battery negative post to alternatormetal frame = 0.20 volt

• negative main cable to engine block =0.20 volt

• negative battery post to starter metalframe = 0.30

• batterypositive post to alternator b+ stud = 0.5 volt with maximum charging load applied (all accessories turned on)

Test the output at the alternator with your volts/ohms multi-meter. You should be measuring 13.8-14.4volts. Load testing the alternator isstill recommended. Check the continuity of your ground connections.

Have the battery and the alternator Load Tested for proper functionin in a test machine that applies a simulated work load. Handheld testers are inaccurate and willoften pass faulty parts.
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