Life Expectancy of 3.8l Alternator? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 4 Old 12-27-2015, 07:36 AM Thread Starter
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Life Expectancy of 3.8l Alternator?

Just wondering how much life people are getting from the OE Alternators on the 3.8? I just noticed the plastic loom coming off the positive output of my alternator is pretty much disintegrated for the last 12" leading to the alternator. I'm wondering if that means it's generating a lot of heat and getting ready to go? It's 5 years old and has almost 80k miles on it. I haven't had any issues though!
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post #2 of 4 Old 12-27-2015, 08:36 AM
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Quote:
Originally Posted by Biginboca View Post
Just wondering how much life people are getting from the OE Alternators on the 3.8? I just noticed the plastic loom coming off the positive output of my alternator is pretty much disintegrated for the last 12" leading to the alternator. I'm wondering if that means it's generating a lot of heat and getting ready to go? It's 5 years old and has almost 80k miles on it. I haven't had any issues though!
that little positive cover cap on the alternator soits right above the front exhaust manifold and takes a lot of heat so it gets brittle ....all of the underhood plastics and hoses or wire wraps will eventually get brittle and dry crack or crumble. Keeping under hood heat-soak away is important for long haul! one of my first mods was the Synergy 14" long hood louvers to minimize those effects & wiping the hoses down every now and then with some plastic safe lubricant like CSC242 will help preserve the plastic life a little , but i digress;

If the electric connection is good and your multimeter is showing suitable voltages or your charge indicator is where it should be , you should be fine . My '11 has 84k and is still charging the battery /assisting the starter fine....personally, I wouldn't judge the electrical integrity by heats effect upon connector covers unless you are seeing odd electrical behavior ....you'll know when the alternator is going South.....clickclickclick........


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post #3 of 4 Old 12-27-2015, 09:18 AM
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For what it's worth the split loom on my alt cable disintegrated about 30k miles ago at 140k.
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post #4 of 4 Old 12-27-2015, 09:28 AM
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I replaced my alternator after 7 years. the wire loom on all cars sucks. Go to autozone and get some more and put it on.

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