dbuzz77 Posted September 10, 2010 Report Share Posted September 10, 2010 the ign light came on today, the battery voltage is going lower, so i assume we're not charging. i thought it was a loose ground on the alt, but it wasn't. I get battery voltage (going lower) on the w/b and y wires at the regulator so i assume the alt is not charging. if the alt was working , the voltage at the regulator would be 13.5 or 14v, am i correct? i need to rebuild the alt? thanks Quote Link to comment
jefe de jefes Posted September 10, 2010 Report Share Posted September 10, 2010 You have a voltage gauge in your ride?Sounds about right. Buy a new one. They aren't that much. Quote Link to comment
datzenmike Posted September 10, 2010 Report Share Posted September 10, 2010 the ign light came on today, the battery voltage is going lower, so i assume we're not charging. i thought it was a loose ground on the alt, but it wasn't. I get battery voltage (going lower) on the w/b and y wires at the regulator so i assume the alt is not charging. if the alt was working , the voltage at the regulator would be 13.5 or 14v, am i correct? i need to rebuild the alt? thanks The external regulator tells the alternator to charge and how much. Don't assume the alt is bad. Is the belt tight? Battery cables tight Ground wire from battery to head tight and clean? * Regulator won't work if it is not grounded to the body or loose. Quote Link to comment
dbuzz77 Posted September 10, 2010 Author Report Share Posted September 10, 2010 i am assuming the alt is bad because the volts at the regulator are down. if the alt was working, wouldn't i see 14v at the reg? (belts and posts tight) Quote Link to comment
dbuzz77 Posted September 10, 2010 Author Report Share Posted September 10, 2010 i went to check the engine ground, looks good. the headlights won't come on, just the park lights. Quote Link to comment
datzenmike Posted September 10, 2010 Report Share Posted September 10, 2010 i am assuming the alt is bad because the volts at the regulator are down. if the alt was working, wouldn't i see 14v at the reg? (belts and posts tight) The alternator could be bad, yes. But the regulator detects low voltage and tell the alt to increase the charge. If it's not working the alt is just along for the ride. Quote Link to comment
dbuzz77 Posted September 11, 2010 Author Report Share Posted September 11, 2010 what's next? i wonder why the headlights don't work. Quote Link to comment
datzenmike Posted September 11, 2010 Report Share Posted September 11, 2010 Parking lights but no headlights.... check the fuse box for good connection or blown fuse. Quote Link to comment
dbuzz77 Posted September 12, 2010 Author Report Share Posted September 12, 2010 found the fuse, bad connection for the headlights. took the cover off the regulator and manually operated the relays, no change to the battery voltage (with the truck running). i would guess it's the alt then? Quote Link to comment
dat521gatherer Posted September 13, 2010 Report Share Posted September 13, 2010 one other thing to do for process of illimination is to clean the ground wires that bolt to the voltage reg. Quote Link to comment
dbuzz77 Posted September 16, 2010 Author Report Share Posted September 16, 2010 had the alt tested, no output. the guy said a strap was broken inside. Quote Link to comment
ggzilla Posted September 16, 2010 Report Share Posted September 16, 2010 When you get the new one installed, test the output. At 1200 RPM is should be between 13.5 to 15.0 volts. No higher or it will burn something out in time. No lower or it won't charge the battery properly. The V out is controlled by the regulator. If you hotwire the F terminal of the alternator (briefly) it should put out more than 15V. Quote Link to comment
dbuzz77 Posted September 19, 2010 Author Report Share Posted September 19, 2010 new alt , all is good. a jumper was broken on the rotor. thanks everyone Quote Link to comment
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