We have lost the maunal to the truck,and we have put a new battery in the truck,and a new alternator in the truck. The light is still coming on saying the battery is not charging. we check the fuse and not sure what the go to.and we have 2 fuse that are biown.Is their any we can go on line to get free manual information?
How did you check the fuse ? look at it ? Use a DMM - digital multi-meter an test for B+ voltage at the heavy gage wire on the back of the alternator . The connector that plug's into the alternator ,that has three wire's in it. This should have B+ voltage as well . Do you know what a wiring diagram is ? How to read one ? Free wiring diagram's here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click on engine ,then under subsystem click charging . Click the search button then the blue link . Test don't guess !
SOURCE: Check charging system icon keeps coming on
I had the same problem with a 99 sable and it was the drive belt
SOURCE: Battery charges when idling but not at speed. 81 datsun
This sounds like the altenator belt is loose. When the altenator is under a load the magnetic field causes the altenator to require more fource to rotate. At higher engine rpms the belt can be slipping on the altenator pulley. There is one other possibility I can think of and that would be that the voltage regulator is faulty and and causing an overvoltage at higher engine speeds and therfore opening up the field circuit to prevent the altenator from over charging the battery this is a safety function of the regulator. I would check the belt first.
SOURCE: Battery dosn't charge, alternator/voltage adapter test's good.
Did you test the Alternator on or off the truck? It might be a problem with the control system to the Alternator. The regulator need a battery feed to work, It is usually ran through an alternator fuse.
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