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1989 Chevy Truck charging system

Tiny
DAPACJ
  • MEMBER
  • 1989 CHEVROLET TRUCK
Electrical problem
1989 Chevy Truck V8 Four Wheel Drive Automatic

battery is good, connections are good. Alt is only putting out 12 volts. No power coming off harness of alt. New alt is new, old one tested @ 14 volts but bearings were bad.
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Wednesday, February 17th, 2010 AT 4:02 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
The new alt sounds bad. Have you tried replacing it?
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Thursday, February 18th, 2010 AT 10:04 AM
Tiny
DAPACJ
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  • 8 POSTS
I haven't changed the new one yet, but I had the same problem with the old one and tested good. There is a silver slow blow fuse in the fuse box, for the battery, I haven't changed. The 30 amp green fuse for the battery is good. The only reason I kept the new alt was the bearings in old one were making noise.I must be overlooking something.
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Friday, February 19th, 2010 AT 1:48 PM

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