Bought this jeep about 2 weeks ago, knew the battery was going bad, yesterday i was on my way to get a battery when i noticed my power was starting to drop. Turned around and made it home right when it hit 9 volts. Bought a new battery and put it in started up the truck, battery was still not charging and i had a check engine light on. Went today and got another alternator from the guy who sold it to me, it should be noted this was a used alternator pulled out of another jeep (he owns a junk yard.) Put it in battery is still not charging but the check engine light is off =(. I am now out of ideas on what it could be, unless my luck is that bad that i replaced a junk alternator, with another junk one, if anyone has an idea please let me know, im hoping its something small that im missing, before i go out and blow $$$ on a new alternator.
Here are a couple of ideas for you to try. First check in the power ditribution box under the hood, there is a fuse for the charging system, either use a circuit tester or just pull each fuse one at a time. Usually it is a 10 amp fuse as it is on my 94 cherekee. if you find any bad fuses replace them with same type and amperage. you should also check the fuse box on the right side of the dash, door has to be open for acess to the cover on the end of the dashboard, check all of those fuses also. If you live near an AUTOZONE auto parts store, take your jeep there and they can test your alternator on the vehicle , or you can remove it from vehicle and take it inside, they can bench test it. If you have a volt meter you can test it yourself, start vehicle, set meter to volts at least 20 or higher , place black probe on negative post on battery, red on positive, look at readout, a good alternator will put out 13.5 to14.0 volts, which is how much it takes to run vehicle and accesories and charge battery. If alternator doesn't put out 13.5 to 14.0 volts it is defective. I hope these ideas help.
There are fuses in the engine compartment that regulate the altenator. Check your fuses and this might help your problem. Helped mine
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Thank you, was a 60 amp alt. fuse in the distribution box. Problem was caused by an overload while using the rear window defroster, because the battery was weak it put to much strain on the alternator, which in turned popped the fuse. =)
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