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Old 11-21-2020, 09:54 PM   #1
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Check Engine light

Same topic different situation. My alternator was replaced by empire in Pensacola. On my way to Tampa Florida for Thanksgiving and lo and behold, about 200 miles down the road, the check engine light came on, fault code 167 and FMI 18, same codes as before, the diagnostic's a bad alternator which was replaced.

The voltage fluctuations have me concerned. I was told that the voltage should be between13 amd 14 volts.

Once the voltage goes a little bit above 12, the check engine light goes off.

I hate to take it back to empire, but I don't have a choice.

Any ideas?

Thanks

Suzzanne
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Old 11-21-2020, 10:01 PM   #2
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A mechanic friend of mine used to say "New don't mean good." I would contact the place where it was serviced last. If you have the tools and the knowledge I might make sure that all of the connections to the alternator and battery are tight. It might save you a trip of a few hundred miles, maybe over 1,000 round trip. Good luck.
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Old 11-21-2020, 10:07 PM   #3
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I will see if my brother can assist. I checked the cables to the batteries and they appeared to be tight, but then again I may be missing something.

Thank you
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Old 11-25-2020, 12:15 PM   #4
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Ok,
Tested the volts on the alternator and it registered 14.27, I am losing 2 volts some where,

Any ideas?

Thanks

Suzzanne
14 Cornerstone15 Jeep Cherokee
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Old 11-25-2020, 01:32 PM   #5
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Quote:
Originally Posted by sdesha View Post
Ok,
Tested the volts on the alternator and it registered 14.27, I am losing 2 volts some where,

Any ideas?

Thanks

Suzzanne
14 Cornerstone15 Jeep Cherokee
Look carefully at the all the battery connections. even a slight bit of corrosion MAY be the culprit. Remove, clean, reinstall. Hope that does it. Otherwise, you MAY have a $$$ battery going bad.
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Old 11-25-2020, 01:39 PM   #6
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Also, look carefully at your BATTERY ISOLATOR (has IN from alternator and OUT to chassis and house battery).


WORKAROUNDS are available.


Will send PM.


Bretty
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Old 11-25-2020, 01:56 PM   #7
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One battery was replaced, reading 13.3 volts, the other battery was not replaced , reading 12.9 volts. Going to replace the older battery that was manufactured on May 2018 and see what happens.

Thank you
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Old 11-25-2020, 02:02 PM   #8
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One battery was replaced, reading 13.3 volts, the other battery was not replaced , reading 12.9 volts. Going to replace the older battery that was manufactured on May 2018 and see what happens.

Thank you

Are those readings with engine running (i.e. alternator charging)?


As measured at the batteries?
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Old 11-25-2020, 06:47 PM   #9
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Yes
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