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Old 12-26-2013, 01:56 AM   #1
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Coil killer!

95 YJ 2.5. 3 coils in 2 weeks. Runs like new until it just dies. ???

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Old 12-26-2013, 06:04 AM   #2
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The only thing that will kill a coil is over voltage. Most coils only want around 8 volts to operate.

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Old 12-26-2013, 07:03 AM   #3
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Cause? Solution? Ideas? Figured as much.
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Old 12-26-2013, 07:18 AM   #4
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Alt over charge maybe. A bad connector or ground issue possible but not likely. Long shot: battery. I'd start with the alternator first.
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Old 12-26-2013, 08:12 AM   #5
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Is there a voltage regulator in the alternator? Or elsewhere? No access to a manual at this moment. Need to fix it today if at all possible.
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Old 12-26-2013, 08:16 AM   #6
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In the alt. Bummer.
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Old 12-26-2013, 08:31 AM   #7
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Yeah, just swap your alt and that should solve the issue.
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Old 12-26-2013, 08:46 AM   #8
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Thx all. Will do asap.
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Old 12-26-2013, 09:30 AM   #9
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Quote:
Originally Posted by rick s View Post
Is there a voltage regulator in the alternator? Or elsewhere? No access to a manual at this moment. Need to fix it today if at all possible.
The regulator is NOT in the alternator, it is part of the ECM and not replaceable without replacing the ECM. The best thing to do is get it running and take a volt meter and see how much voltage is at the coil. The coil is controlled by the ECM. One thing that you might try is to install a ballast resistor in the positive wire going to the coil. Ballast resistor from a 70s something Chevy or Ford may work, kinds a shot in the dark but that's where I'd start.
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Old 12-26-2013, 09:43 AM   #10
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Lol. Just found that out lol. Have another ECM. volt meter in dash is in the red. Should I swap the alt or ECM?
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Old 12-26-2013, 09:47 AM   #11
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Nearly pegged out! Almost 19 volts.
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Old 12-26-2013, 10:11 AM   #12
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Should I put the resistor coming out of the solenoid like an old Chevy? Or just in front of the coil itself? Like this idea!
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Old 12-26-2013, 10:34 AM   #13
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Which wire is hot to the coil? Green/orange stripe or grey? Guessing green/orange stripe.
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Old 12-26-2013, 01:11 PM   #14
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Quote:
Originally Posted by Redrider94 View Post
The regulator is NOT in the alternator, it is part of the ECM and not replaceable without replacing the ECM. The best thing to do is get it running and take a volt meter and see how much voltage is at the coil. The coil is controlled by the ECM. One thing that you might try is to install a ballast resistor in the positive wire going to the coil. Ballast resistor from a 70s something Chevy or Ford may work, kinds a shot in the dark but that's where I'd start.
Actually the ballast resistors from early 70s Chrysler cars are cheaper and easier to install. Just 2 wires and bolt it down ceramic and bullet proof.
__________________
95 YJ 2.5 5 speed 33" Mud Rovers SOA
A frustrating WORK IN PROGRESS
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Old 12-26-2013, 01:23 PM   #15
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Got one on it. Even a convenient attachment spot. Oil dipstick bracket bolt down. See what happens now lol. Gauge still reading 18volts. Coil not getting it now though. Drove it 35 miles so far. All good. Thx!
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Old 12-26-2013, 02:45 PM   #16
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Got one on it. Even a convenient attachment spot. Oil dipstick bracket bolt down. See what happens now lol. Gauge still reading 18volts. Coil not getting it now though. Drove it 35 miles so far. All good. Thx!
Have you checked the battery voltage with a voltmeter ? The dash meter's are not that accurate! You may be over charging which will damage your battery at that voltage, sounds like you have a overcharge problem. If that is the case not only can the battery be damaged but also the ECM. I'd get that checked ASAP !! Any of the auto parts houses will check your charging system for free.
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Old 12-26-2013, 02:50 PM   #17
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Try swapping the ECM( I didn't see your other post that you had a spare ECM) try swapping it and see if that drops your voltage. You may need to remove the resistor to get your jeep run after the voltage comes back down.

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