Charging system not charging

[FatalStylez]

So I got my alternator tested and it tested good. Got a new battery and checked all the fuses, Don't know whats wrong. Battery light comes on and so does the brake light, But I think the brake light is in sequence with the alternator wiring. Any ideas.

 

[polobai]

check the main fuse for the alternator, its located in the engine bay fuse box and needs to be unbolted.

 

[FatalStylez]

checked it already, nice call though

 

[tbcmorris]

put a volt meter on it when its running post the result...im thinkin dead cell in your batt?

 

[FatalStylez]

it started when I have a different battery, I got a new one and its doing the same thing.

 

[tbcmorris]

ok, get a voltmeter on it while the cars on, and then again when its off...post results

 

[FatalStylez]

k cant till monday. cars in the shop at school. a know when it was started we had a voltmeter on the battery and it wasnt charging it stayed at like 12.4 and didnt go up and after a while went down

 

[polobai]

Check for continuity on that fuse, when mine blew it looked fine but it had a tiny crack in it.

 

[jdub]

Did you test the alternator like this:
http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?S=CH&P=4

Doesn't sound like you did

 

[FatalStylez]

I took it to oreilly's and they tested it

 

[jdub]

check the main fuse for the alternator, its located in the engine bay fuse box and needs to be unbolted.

Check for continuity on that fuse, when mine blew it looked fine but it had a tiny crack in it.

If the 100A fusible link is blown, the starter will not work.

Two fuses that need to be checked are the 7.5A Ignition and 15A Engine fuses. Both are in the drivers side kick panel.


Fonz - Suggest you test the alternator per the TSRM link I posted.

 

[FatalStylez]

see when I took it to oreillys when they tested it, he hooked neg to the body of the alt. positive to the post. and it passed, What about the voltage Regulator? He never plugged anything into that slot

 

[hvyman]

do the amp test like tsrm says. a dmm is your friend for troubleshooting electronics.

 

[sen98037]

k cant till monday. cars in the shop at school. a know when it was started we had a voltmeter on the battery and it wasnt charging it stayed at like 12.4 and didnt go up and after a while went down

You sure you have the right sized alternator for your setup?

 

[FatalStylez]

ya its the oem alternator

 

[FatalStylez]

Well it turns out oreillys doesnt know how to test an alternator

 

[jetjock]

he hooked neg to the body of the alt. positive to the post. and it passed, What about the voltage Regulator? He never plugged anything into that slot

Well it turns out oreillys doesnt know how to test an alternator

That was obvious three days ago...

 

[jdub]

That was obvious three days ago...

It sure was... :3d_frown:

 

[FatalStylez]

ok well im saying its the alternator thats bad

 

[Tire Shredder]

ok well im saying its the alternator thats bad

I would say you are right