You might try this

 

Where is this connection located? I dont have access to compressed air, could i use electrical contact cleaner in a spray can? what about brake cleaner?

 

dang, I'm stumped

 

you dont have a efan do ya? last time i had a crazy voltage/ dash dimming/ stalling/ possessed truck problem like this ( im blaming my issue on the efan) i ended up doing an optima battery $179 and ho alternator $380 ! expensive though, and that seemed to have fixed my problems. again, i think my efan motor is wearing out so im anxious to see what happens in a few months - 1 year time ..heres the thing, i turned my efan sensor up a little more and it doesnt do it anymore , i think my fan was running a little more than it should of and kept eating up the voltage it still may to this day i dont know

 

That's interesting. How do I tell if I in fact do have an E fan? If I do, how do you adjust it like you mentioned?

 

It's aftermarket, it would be an electic fan behind your radiator.