charging system issue

150,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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STENNY
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  • 13 POSTS
so my truck battery won't charge. i have replaced battery, alternator checked grounds, added grounds still can't get battery to get a charge.
Feb 9, 2016 at 4:06 AM
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JOHNNYT73
  • ✓Experienced Mechanic
  • 924 POSTS
Check all fuses/fusable links. Use a multimeter to check voltage at the battery and the voltage at the alternator. If it is 13-14 volts at the alternator, but only 10-12 at the battery then you know there is a connection issue between the two.
Feb 9, 2016 at 4:33 AM
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STENNY
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  • 13 POSTS
yea it is a little less between the 2 but i can't figure out why i ran a new wire from alt to battery and that didn't help anything. i believe its the gauges. but there is also a battery fuse which has no power going to it. and i recently had battery to starter wire arc out and touch metal and melt wire and kill old battery ever since i have had charging issue it seems like battery connects to start the truck then when truck is running alt is running everything on truck but not charging battery because when i shut down the truck it has same power it did before engine started
Feb 9, 2016 at 5:00 AM
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JOHNNYT73
  • ✓Experienced Mechanic
  • 924 POSTS
Sounds like you know the issue. You need to trace that write to that fuse and see where it failed.
Feb 9, 2016 at 5:05 AM
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STENNY
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  • 13 POSTS
It was actually not battery fuse it was crk whatever that is
Feb 9, 2016 at 9:47 AM
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STENNY
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  • 13 POSTS
What does this black box on firewall that had a fuse inside goto? I checked fusible links they all seem good
Feb 9, 2016 at 9:49 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,579 POSTS
That is a system fuse, are all the fuses in the fuse box that need to be? sounds like you have one missing
Feb 15, 2016 at 12:16 AM
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