The Good Alternator, The Bad Gauge, and the Ugly Jeep - Jeep Wrangler Forum

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Old 10-26-2013, 04:16 PM   #1
TylerU's Avatar
Join Date: Apr 2013
Location: Salt Lake
Posts: 438
The Good Alternator, The Bad Gauge, and the Ugly Jeep

I'm posting an XJ question here, coz the cherokee forum is so dead...

So This what has been happening to the jeep, I'm hoping any of yall jeep doctors can give a diagnosis or something:

Patient - 96 XJ, with confirmed bad NSS(because I can start in Any gear I want), and coolant sensor(for gauge, because it's not showing the temp).

Symptoms, Before: the voltage gauge stays around the edge of 9 of the red zone. And it doesn't move no matter what gear I'm in or how long I've driving. NO GEN Light.

Symptoms, Recently: voltage gauge stays around 9, upon start up, NO GEN light. and it'll jump to somewhere near 12-13ish. But from yesterday to today, the GEN light will kick on, after start up when it's around 9, and later when it jumped to 13ish, GEN light won't turn off for the rest of the trip.

I took it to Autozone. Check result shows, Starter, Battery, Alternator are all good..
So I'm clueless. Any ideas?

bonus question:
I posted another thread earlier about MPGs.
I also noticed, there is fluctuations on my fuel gauge as well.
It was refilled at 240miles, and now it's 320miles - 80 miles, and it says I've burnt more than 1 quater and a half (7-8 gal) on the gauge.
And sometimes, it'll fall back (closer to the next marker - half tank, in this case), but never bounce back more than what it was before.

And I was driving 2013 Elantra and 2012 Altima, so I do feel this XJ accelerates a lot slower, and doesn't give much gas, with the same pressure on the pedal. I was always the slowest to catch up after the light turned green. This is my first Xj, so I don't know if it's because I'm used to be a light foot, or something isn't right.

I'm only on 235/75/15 - why do I get shitty fuel economy?

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Old 10-27-2013, 01:06 PM   #2
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Old 10-27-2013, 01:58 PM   #3
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Join Date: Jul 2012
Location: south georgia
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generator light gets its power when the ignition switch is turned on..the other leg of the light goes to the alternator..this is called the exciter circuit..the bulb drops the voltage just a little which in turn triggers the alternator to start charging..when the alternator starts charging then it puts voltage onto this when you have voltage on both sides of the bulb it goes out....that is basically how the bulb works...Now,once the rpm's pick up a little the alternator will normally start putting out even without this exciter circuit...I would guess that maybe you have a bad connection on this exciter wire where it plugs onto the alternator
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