I got a 92 F350 7.3L diesel , Ireplaced the alternater,regulater,solenoid but Ican`t get more than 12v out of the alternater unless I bring the rpm up to 2000 and if I turn the lights on I`m pulling it down all the time.

 

Have you tested the batteries? If a battery is not accepting a charge or has an internal short, the whole system may have a low volt reading. Are you using a voltmeter or the dash meter? if you are using the dash one, get a voltmeter and double check it. It might be lying to you.



88 F-150 4X4 w/5.0 EFI 5 spd
86 Ranger 2WD w/2.3L EFI 5 spd to be 351W 4bbl C4

 

Thanks for replying. Iwas checking everything with my voltmeter.Itook my battery back that I had just bought in December and the computer said it was goodbut low,so they put it on trickle charge until tomorrow night.So I`ll let you know tomorrow night how I make out
Thanks again.

 

One other thing, I've heard that if you need to replace a battery on dual-battery set-ups, they must be the same output in cranking amps and everything.



88 F-150 4X4 w/5.0 EFI 5 spd
86 Ranger 2WD w/2.3L EFI 5 spd to be 351W 4bbl C4