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  #1  
Old 01-20-2018
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Location: Millry
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The other day my alternator went out on me. So I went and got a new one, as soon as I installed the new one on it was bad. I took it back and got them to test the new one and it was good. I came home and installed the second one and it burnt up. I can't figure out why my truck keeps burning the alternators. Also it will not idle and if you drive it as soon as you get over 2000 rpm it dies but not at idle. It started all this when my alternator went out. This is a 1994 4.0 4x4 thanks for any info
 
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Old 01-21-2018
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Welcome to the forum

Whats the age of the battery?
12.8volts is a new battery
12.5volts is 3/4 year old
12.3volts is 5/6 years old and time for new battery


You need a volt meter set for DC Volts
Hook up alternator wires

Key OFF
test battery voltage, lets say it is 12.5v

B+, larger wire on Stud on back of alternator, should be 12.5v, if not then you have blown Fusible links

Unplug 3 wire connector from alternator
Test Yellow wire, should have 12.5v, if not then blown fuse in engine fuse box, ALT fuse #20

Test Green wire, should be 0v
Turn on the key, test green wire, should be 12.5v now, if not then blown fuse in cab fuse box
 
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Old 01-21-2018
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Ok so i found my problem with the alternator. I had a short. But its still going dead. You have to give it gas in nutruel to keep it running. If you drive it when you hot a certain rpm it dies.
 
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