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Old 06-26-2016, 11:00 AM   #1
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CHARGING SYSTEM

Hey everyone,

I have a 98 mustang gt. Recently my battery light came on. I bought a new battery and put it in. I put it under a load lights,ac,stereo and the alternator would not stay at 14v. So I replaced the alternator as well and I'm still getting the same issue. When I turn on the lights or the ac it will drop my the reading on the voltmeter to 12.57 it's supposed to jump back up to 14 again. Fuses are good and connections are good. Any ideas.. PLEASE HELP. THANKS

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Old 06-26-2016, 08:29 PM   #2
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I know that you already checked the connections, but double check the negative battery cable, and make sure that it is securely fastened to the engine block.
If everything looks to be in good condition, then have the brand new alternator tested. It may be defective.
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Old 06-26-2016, 10:09 PM   #3
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And again had the same issue used an ohm reader on the pigtail connection with the ignition off you only have volts on one of the wires and with the key in the on position your suppose to have same volts on both wires if not then your pigtail or the wires there are bad I peeled back the harness about 6 inches and my wires were frayed so I replaced the pig tail and now all is good

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Old 07-03-2016, 07:14 PM   #4
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I got another new alternator and a new baterry and I'm still having the same problems. Under a load it will not kick back up above 14v. I replaced the baterry terminals and still same issue. Any on know of were the grounds are on an 98 gt. Starter is getting 12 volts like it supposed to. Please help I've hit a dead end. I even removed all my stereo equipment.

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---------- Post added at 12:14 AM ---------- Previous post was at 12:13 AM ----------

I also changed the pig tail

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Old 07-03-2016, 08:12 PM   #5
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If you are referring to the ground for the battery, the cable is bolted to the engine block.

Did you confirm that there is voltage at the connector?
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Old 07-03-2016, 09:13 PM   #6
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Yes there is voltage there. And there is voltage at the pig tail

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Old 07-04-2016, 12:45 AM   #7
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Well it seems like you have exhausted all of the common things to check. The only other thing that I can think of, is there are two fusible links associated with the charging system that exit from the power distribution box in the engine compartment, that you can check.
My only recommendation, at this point, is to carefully inspect all of the wiring and battery cables for any signs of damage. It would be helpful to have a wiring schematic that is specific for your car so you can more easily check the circuits that are most likely to cause a problem.
Or, perhaps, you can find a reputable shop nearby, that specializes in diagnosing automotive electrical systems.
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