Ok the truck is still not charging, but I found out that it has an 1984 c10 350 engine in it. The wiring is still the 87 though. I can't figure out why its not charging. I had the alternator tested again and they said its running great, but when its in the truck the gauge shows low and the shop said there is no output at all (they look like they were afraid to even touch the truck, they were stumped). The alternator that is on it is for an 1988, could that be a problem, its hooks up to the wiring just like the previous one. I cleaned the connectors to the battery too, i dont think that will help much, but at this point im desperate. Help if you know, or think you know what the problem is.
Ok I had the wiring looked at and the wire to the back of the alt. post is live so its working and the one that plugs in is working also. The mechanic said that my starter could be giving a draw and that could be the problem. Could the starter be making it not charge, bc its starts up fine?
2007-04-29 12:20:16 · 6 answers · asked by Kenneth B 1 in Cars & Transportation ➔ Maintenance & Repairs
Your alternator needs a secondary source of power to "excite" the charging circuit.
Under the dash is your fuse box.
There should be a fuse (15 amp) that is marked [ALT] for alternator.
This is the circuit that tells the alternator to basicaly turn on.
Test that fuse for power. It should have power to it when the key is on. Make sure the fuse is good too.
If that is good, check for power to the alternator. Not the big wire to the battery, but the excite circuit wire when the key is on.
2007-04-29 12:38:47 · answer #1 · answered by Mr. KnowItAll 7 · 0⤊ 1⤋
If your truck is an 87 and the alternator is for an 88, that might be the problem. How old is the battery? Try replacing the starter and the battery
2007-04-29 12:25:25 · answer #2 · answered by andy 4 · 0⤊ 0⤋
i own a repair shop and i think you need a good mechanic that will be able to tell you what is wrong with it,i do this all the time and i cant believe they cant find this ,take it to an old school mechanic and have him do a draw test on it,he should know how to do it the old way ,and he can find this one, main thing you to concentrate on also is, that this vehicle functions mainly on a ground system,and a break in any ground wire will cause a lot of problems with it,the solenoid switch on the starter can be causing a draw on it but then again they should be able to find it,like i said find someone that has been old school learned ,and they can find the problem,i have solved more of these than i have fingers and toes to count,it can be fixed,nothing is impossible,good luck with it hope this helps.
2007-04-29 16:21:16 · answer #3 · answered by dodge man 7 · 0⤊ 0⤋
Check that the smaller wire is connected to the field terminal [marked F1] and has power with the ignition turned on.The plug has 2 wires,one is to the gauge and the other is directly to 12v ignition.They could be reversed.Of course the other,heavier, wire goes directly to the battery positive.
2007-04-29 13:06:00 · answer #4 · answered by wildmanny2 7 · 0⤊ 0⤋
attempt this.... with the truck operating, disconnect the constructive battery terminal, if the truck retains operating the alternator is sturdy and is charging. If it dies then the alternator is undesirable. I noticeably doubt the starter is inflicting any complications.
2016-11-23 15:42:20 · answer #5 · answered by ? 4 · 0⤊ 0⤋
you say there is voltage at altinator. What is it? Measure that and compare it to the voltage at the battery terminals. It should be approx 14.5volts. give or take, at both places.
2007-04-29 12:25:46 · answer #6 · answered by pappy 5 · 0⤊ 0⤋