Dirtman
Former Middleweight Moss Fighting Champion
- Joined
- May 28, 2018
- Messages
- 19,304
- Reaction score
- 13,326
- Points
- 113
- Location
- 41N 75W
- Vehicle Year
- 2009
- Engine Type
- 2.3 (4 Cylinder)
- Transmission
- Automatic
- 2WD / 4WD
- 2WD
- Total Lift
- It's up there.
- Total Drop
- It's down there.
- Tire Size
- Round.
- My credo
- I poop in the furnace.
Asking for a buddy. He bought a 2001 f350 with a blown up 7.3. We swapped in a new "used" motor and got it running great (had to replace the IDM) but now it's got a charging issue.
It started and drove fine, checked voltage at the batteries at startup and got 14.2 which is ok. But this is a twin battery single alternator truck. Out of my league. After a while the alternator apparently fried and now is only putting out 8 volts.
Swapped alternators, problem solved... for another 50 miles or so. Fried another alternator.
Now here's my understanding, with twin batteries it obviously must have a isolator so the alternator doesn't charge both batteries at once or let the batteries back feed each other correct? With 2 known good batteries and a known good alternator is it possible the isolator is bad and allowing the alternator to dump into both batteries at once and overloading it?
Thoughts? I'm not familiar with twin battery setups.
It started and drove fine, checked voltage at the batteries at startup and got 14.2 which is ok. But this is a twin battery single alternator truck. Out of my league. After a while the alternator apparently fried and now is only putting out 8 volts.
Swapped alternators, problem solved... for another 50 miles or so. Fried another alternator.
Now here's my understanding, with twin batteries it obviously must have a isolator so the alternator doesn't charge both batteries at once or let the batteries back feed each other correct? With 2 known good batteries and a known good alternator is it possible the isolator is bad and allowing the alternator to dump into both batteries at once and overloading it?
Thoughts? I'm not familiar with twin battery setups.