[JBachman]

I hate to play devil's advocate here, and I know this is gonna piss off a lot of people but... Why the hell are you modifying your electrical system if you have no basic knowledge of how these systems work or interact with each other? I have been an installer for more years than I care to remember and I am stunned by the number of vehicle owners who try to do it themselves and wind up causing significant and potentially costly damage. Just my view.

-josh

 

[JBachman]

There is quite likely a fusible link on the positive battery cable between the battery and alternator. Check continuity on that cable. If there is no continuity, the link is blown.

 

[JBachman]

Also... you can try to reset the ECU, pull the ECU fuse.... however, the BCM could be the culprit....

 

[JBachman]

The BCM is the Body Control Module. Controls basically everything except engine control... like power accessories, dash guages HVAC and the like.