2007 compass - Jeep Compass Forum
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post #1 of 2 Old 09-19-2016, 02:33 AM Thread Starter
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Location: illinois
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2007 compass

My fiance has a compass 2.4L 2wd. I am trying to trouble shoot an issue with the charging system. She had an issue where the bearing on the alternator went bad it was just making noise. I replaced it and the noise was gone, however now for about a year (she never tells me anything on whats wrong with her car) since the new alternator has been replaced the lights will dim even while driving if you roll the window up ( I mean if there up already and you roll them up to make sure or even lock the doors) I noticed this while I was driving the car at highway speeds or even at idle. The battery is less than 2 years old. I've tested the battery and alternator output and everything checks withing typical range. I have only used brand new parts (battery alternator) I've followed the recommended guidelines for everything on this car tune ups and regular maintenance. Any suggestions? Thank you in advance!

Last edited by cvpi06; 09-19-2016 at 02:37 AM. Reason: minor info update
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post #2 of 2 Old 09-20-2016, 08:55 PM
Join Date: Sep 2016
Posts: 65
This sounds like a problem with voltage output from the alternator. It should read between 13.8 and 14.2 volts feeding the battery. The battery should read 12.6 volts or above. If the battery has been tested as good, then there is a problem with the alternator. Is the pulley diameter on the replacement the same as the one you removed?

If the voltage is high, it's possibly the voltage regulator. If it's low, check your connections to make sure they are clean and tight. Also, check to make sure there is no belt slippage.

Clyde--True Blue Pearlcoat 2016 Compass Sport 2.4L 6-speed. Additions since brand new in September of 2016: 4X Alpine SPJ-691C3, Weathertech floor liner Front only, Scosche Magi-Mount, USB charging port added to glove box, USB charging ports added to rear passenger area, Hum, Curt 13081 class III receiver. More to come!!

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Last edited by Stringplucker; 09-20-2016 at 08:58 PM.
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