Need help with charging system!

[JonathanB86]

Hey guys,

Got the dreaded battery light on my 2004 Mazda B4000 and managed to make it to the nearest town on battery power.. Took a week to get a new alternator in and just installed it to no avail. Still not getting any charging action.

Are there any fuses or fusible links that are hiding somewhere that I can possibly replace or check? My owners manual does not show any fuses in either box for the charging system or voltage regulator.

PS... I just spent over $300 on the alternator and shipping and gave my old one back as a core.

EDIT: The Harness that plugs into the voltage regulator does have voltage on two pins. When testing the B- terminal and the Alternator stud wit a multimeter I get 4.36V :S Also checked continuity between stud on alternator and battery + terminal and it was good.

 

[Earl43P]

4 volts is NFG.
Sounds like your cable is bad.

There should be a cable from B+ to the UHJB (fusebox), then another cable to the alternator.
In between them is a 125A Maxifuse, biggest one in there.
Check that.
Then check for a smaller 30A fuse marked alternator (fuse #14 in a 2000).
Check it.

If they're good, the cable to the alternator probably corroded under the insulation. Replace it.