Not charging battery-Alt. tests good by NAPA
10-06-2018, 12:25 PM
#1
Junior Member
Thread Starter
Join Date: Sep 2018
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Not charging battery-Alt. tests good by NAPA
97 F150 4.6 auto 4X4 mechanical. The small 20amp fuse is good and continuity good to alt. plug. Voltage on one pin,ground okay but high Megohms to third wire even with ignition on. Dash light may be burnt out- Wish I had a better print to work with. The dash gauge shows battery voltage dropping as it runs and if lights are on it drops pretty fast.Interstate battery shows 12.86 and I have been charging it but running shows 12.09 and truck dies around 10volts. I read some other posts which were helpful and I will wiggle harnesses and don't know how old the Alt. is, looks like a reman. tested good cold at Advance and napa and O'reilly
Last edited by I-DO-IT; 10-06-2018 at 12:43 PM. Reason: Added info
10-06-2018, 02:30 PM
#2
97 F150 4.6 auto 4X4 mechanical. The small 20amp fuse is good and continuity good to alt. plug. Voltage on one pin,ground okay but high Megohms to third wire even with ignition on. Dash light may be burnt out- Wish I had a better print to work with. The dash gauge shows battery voltage dropping as it runs and if lights are on it drops pretty fast.Interstate battery shows 12.86 and I have been charging it but running shows 12.09 and truck dies around 10volts. I read some other posts which were helpful and I will wiggle harnesses and don't know how old the Alt. is, looks like a reman. tested good cold at Advance and napa and O'reilly
.
10-07-2018, 11:04 AM
#3
Junior Member
Thread Starter
Join Date: Sep 2018
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Up and running !
Much better print than the Haynes Manual. Thanks. The fuse between the Ignition and Instrument cluster had only one male contact making with the fuse box. Someone in the past must have jammed another wire or something in with it and it wasn't making, felt resistance going in and out but only one leg , no feel using a tool but by hand I could tell. It checked good with the VOM initially so I moved on. I put a twist on a new fuse and everything came back to life . I chased that problem for two days .