GEN 1 Dash lights go crazy under hard acceleration ...?

[ruffstuff]

Check the battery to alternator cable.

I had the same thing happen to my 2011. I discovered the cable was bad by hooking up a voltmeter to the battery and while the engine was hot and running, I pushed on the cable and noticed a slight voltage drop, very slight. I replaced the cable and the issue went away.

 

[Sandfreak520]

Ok so update haven’t driven the truck in last few days. Went to drive it today tried to get the systems to act up and nothing...... then the battery warning light came on and has stayed on. Took it to local shop really quick they tested battery and alternator both were fine.....? So I’m guessing may be main feed cable from battery to fuses or maybe cable from alternator to battery..? Crap!! Stupid electrical gremlins

 

[Sandfreak520]

Ok so update haven’t driven the truck in last few days. Went to drive it today tried to get the systems to act up and nothing...... then the battery warning light came on and has stayed on. Took it to local shop really quick they tested battery and alternator both were fine.....? So I’m guessing may be main feed cable from battery to fuses or maybe cable from alternator to battery..? Crap!! Stupid electrical gremlins

 

[Sandfreak520]

Checked alternator harness and volts were up and down 2 volts when I wiggle it . Think that’s the issue fingers crossed

 

[Sandfreak520]

Hey guys battery to alternator cable was the issue the main wire where it went under the upper radiator hose had an internal fray in the wire. Replace the entire harness problem solved