Please HELP!

8

89revival

Member
#1
#1
The car is an 89GT. I am having a charging system problem I just can't figure out. The car charges just fine until you put a load on the charging system. As soon as the headlights are turned on or the blower its begins to discharge. The voltage just gradually drops. The only way to keep it charging is to raise the idle. I have put the factory pulleys back on, I have tried two different alternators, just tried another voltage regulator, tried two batteries. I have no blown fuses, I have good grounds and the battery light proves out. The battery cables are brand new ford cables. I don't really want to put a 3G on right now. The ammeter works correctly.
 
eddie

eddie

Well-Known Member
#2
#2
take it to advance auto have them put a test on the alternator / did u check the plug that goes to the alternator follow the wire make sure thir is no bad spots or corrosion any ware
 
8

89revival

Member
#3
#3
Advance auto can only check to see if it charges. They cannot test the voltage regulator. The wires are good. This alternator does charge, just does not put out enough under load.
 
M

MstngBabi

Well-Known Member
#6
#6
well first when was the last time you changed the battery? check grounds make sure everything is in good shape.... how old is the alternator thats in the car now? is it ford or aftermarket china made crap??
 
Last edited:
jkstang78

jkstang78

Well-Known Member
#7
#7
MstngBabi said:
well first when was the last time you changed the battery? check grounds make sure everything is in good shape.... how old is the alternator thats in the car now? is it ford or aftermarket china made crap??
Click to expand...

Also beside what she says. Have you tried an aftermarker Gauge like 1 from autometer and see what that is saying. Most times the factory Gauge is not always correct.
 
8

89revival

Member
#8
#8
I have put a VAT on it and it definately doesn't charge under load. The VAT agrees with the gauge. I think I'm going to try another cluster. Something in the cluster must ground the voltage regulator to tell it to charge harder.
 
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