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Altinator is not charging battery?

Tiny
TRISHLYNN77
  • MEMBER
  • 1994 CHEVROLET LUMINA
  • 180,000 MILES
I have tested both altinator and battery, re wired everything down to the silinoid/starter, checked the grounds, all ok. She was running great and then all of a sudden started acting like a bad altinator after I rebuilt the alt myself, put new voltage regulator in it and now she wont hold a charge. What else should I look for? If it were my cam she wouldnt start at all, right?
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Saturday, September 24th, 2011 AT 2:17 AM

9 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Did you replace the fuseable link between the alt and the battery? If it is bad, no power can get to the battery from the alt.

Let me know.
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Saturday, September 24th, 2011 AT 2:19 AM
Tiny
TRISHLYNN77
  • MEMBER
  • 15 POSTS
Well the fusible link that I had down there was melted, so I replaced it with straight wire. It starts and runs as long as im drawing from another vehicle. The one wire down there I am concerned with is like an 18 gauge wire that I have connected a 12 gauge wire to the starter from the harness. Which wire needs the fusible link? Because I can only get a 12 gauge fusible link and its smaller than that.
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Saturday, September 24th, 2011 AT 3:12 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Dont put any wire in replace a fuseible link unless you want a fire. You need to disconnect the battery and charge it. Then if it passes a load test. Did you replace the brush assy. And diode when you replaced the alt. Reg?Your gonna have to get a test light or a multi meter for checking voltages.
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Saturday, September 24th, 2011 AT 3:44 PM
Tiny
TRISHLYNN77
  • MEMBER
  • 15 POSTS
Ok. Yes the altenator tested fine, so did the battery. New starter and solenoid and crank sensor and throttle sensor. I have my haynes manual but the darn thing doesnt show the wires to the starter, there are two posts on my solenoid one that is overloaded with wires and the other little post has one little purple wire. I was told it didnt matter which post the wires were on, is this true? I just put the fusible link back on, and now nothing. It wont even crank or fire now?
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Saturday, September 24th, 2011 AT 5:30 PM
Tiny
TRISHLYNN77
  • MEMBER
  • 15 POSTS
Also checked all voltages, all ok. Dont know what to do now. And I have been doing this for years.
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Saturday, September 24th, 2011 AT 5:31 PM
Tiny
TRISHLYNN77
  • MEMBER
  • 15 POSTS
Also just tried to put the fusible link on the other stud at the solenoid but it wont fit? The fusible link to the post is too small. I am trying to find a diagram for this because this isnt making any sense to me. Everything caught fire at the starter solenoid 8 months ago, I rewired it then, and she ran great until now, no symptoms, just quit starting out of nowhere. Got the schematics from gm the first time and all was good.
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Saturday, September 24th, 2011 AT 6:02 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Dont be switching the wires!Check the large wire on the selonid for battery voltage. The purple wire comes from the ingition switch. Check it for voltage when the key is in the start possition.
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Saturday, September 24th, 2011 AT 9:13 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Also make sure the purple wire is on the s terminal on the selenoid.
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Saturday, September 24th, 2011 AT 9:19 PM
Tiny
TRISHLYNN77
  • MEMBER
  • 15 POSTS
Thank you so much for your help. This was a wired nightmare. Nothing originally was where it was supposed to be when I first started, there was not even a ground strap on the motor. I found a hot spot in the harness from the battery to the altenator, also putting the fusible link where it was supposed to be helped. Thank you so much.
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Sunday, September 25th, 2011 AT 4:07 PM

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