So I have a 03 evo I Took the motor out to do a rebuild do to a spun rod bearing alternator was working perfect put motor back in car alternator took a crap, went and got a new one and it will not charge the battery seems like it's not getting a power signal I did take it out and had it tested and it's good has anyone had this issue before? Thanks for the help

 

Check all of you connections. Same exact thing happened to me when I buuilt my motor. Wiggled a few connections and it worked again.

 

What connections did I wiggle? I been looking at all the damn earths and plugs it all seems okay

 

Check the fuse at the positive battery connection. It is the 100 Amp fuse.

Also a 7.5 Amp fuse. I think it is under the dash in that fuse box. This is the fuse that is for the ignition on trigger for the armature in the alternator.

 

I checked both fuses and they are both okay anymore suggestions ?

 

are your gauges hooked up? See a battery light? check that white connector mine broke its temperaily Zip tied in :/

 

The gauges are connected and te battery light is not on I checked for power directly from the alternator and it is not putting anything out at all. What white connector are u referring to ?

 

Bump still have this problem anymore suggestions please help

 

I would take alternator back and have it tested

 

there is a white plug that hooks into the alternator, 3 wires i think. That breaks, it wont charge and you WONT get a battery light on.

 

OP can you confirm if this was the cause? i would love to know just for future reference.

 

I had an issue with my alternator plug where it APPEARED like it was connected but I was killing mini batteries. The way we I started figuring the problem out was by letting the car running and touching the wires going to the plug close to the alternator and every time i did the car's idle fluctuated.

If its the plug and the orange piece on the inside of the plug is missing or broke nI can give you a site where i found a OEM replacement.

 

Check the b+ wire from the alt it's the wire held down by the nut separate from the connector. When I was breaking in my engine my b+ burnt up for some reason and the alt stopped charging. Ran a 0/0 wire wire for a new b+ wire and now the alt charges perfectly. If you test the end attached to the fuse box you should see 12-14v at the ring connector otherwise you will need a new wire. Ideally should b closer to 14v but as long as it's over 13 it's not your problem, if it's between 12& 13v you have too much resistance and I would replace. And that is of course assuming ur fuses and connector are good.

 

I can confirm this, Had this issue while repairing my Tcase. After i finished my gauges
[overlay to make the dash not show ACD anymore]
I pluged my gauges back in, filled her up with fluids and ran the car, i Got NO battery light and the turbo timer voltage was reading 11.80 an dropping, so i was not charging at all. I thought it was my dash cluster, because with that unpluged it ALSO wont charge while running. turns out it was the plug on the alternator, the tab broke off and it slid down so it wasnt making any connections at all.