Help: battery, starter or maybe alternater issues... maybe

[90cummins]

I can't figure out what's going on with my pickup, the battery started dying on me a couple months ago and i swapped it out and it was ok for a while, then i replaced the plunger and contacts on the starter solenoid which helped then i stopped driving it for a while cause it kept dying and 3 days ago i put in a new alternator and a second battery and it still keeps dying and i don't know what the next move is... any advice would be greatly appreciated. thanks guys.

[wideopen]

Sounds like you have something draining the Batteries? Or the Alternator isn't charging?

[oldestof11]

I say a dead computer if it is 92-93, otherwise check your relay.

HTH,

Jon

[cumminspride]

If it's a NON-IC truck or an early 91.5 it should have a votage regulator on the firewall directly above the exhaust manifold. To change this, disconnect the battery, remove old reg. install new, then plug in, then reattach battery. If the new reg gets plugged in and has any voltage in it and then is grounded they usually go bad.