Charging Ligth Always On

[pendiuu]

Hey guys i got a te72 corolla wagon an 82....well I got the charging light always on for some reason and I have replaced the alternator, voltage regulator, batery and nothing ...still there.........I check for continuity on wires and is good. When I checked the battery input it reads 18 volts wich I know is way too much.....so I took the voltage regulator off and the voltage drops down to 14 V like it should....can someone help me ...I'm running out of ideas....thanks

[KE30_KE35_KE55]

Hey guys i got a te72 corolla wagon an 82....well I got the charging light always on for some reason and I have replaced the alternator, voltage regulator, batery and nothing ...still there.........I check for continuity on wires and is good. When I checked the battery input it reads 18 volts wich I know is way too much.....so I took the voltage regulator off and the voltage drops down to 14 V like it should....can someone help me ...I'm running out of ideas....thanks

have you checked continuity of all the earths to the regulator also chassis/body to engine earths. I have seen a Ke30 putting 18 volts in once that was a stuffed battery. the battery will also boil dry and warp the plates anything over 14.2 volts.

[Rolla__Boy]

He replaced the battery already, and anything up to 14.5 volts is fine, once you get over 15 you have some serious issues.

[pendiuu]

The batery has been replaced same with the regulator and all wires got good continuity......will replaced the regulator again in case it came defective from factory...I will let you all know if it got fix or not.....I also found the wire coming from the alternator to the fuse link to battery burn out...replaced it and the problem is still there....when I open the regulator it looks like some wires where burn out so anyway i will let you all know as soon is replaced.....How much voltage is outputted by the alternator? and thanks for the help.

[Medicine_Man]

Sounds like a truck we had a work, Once it loses its battery sense wire then it starts overcharging. The windings in the regulator can't handle the increase in voltage/current and fry the regulator.

[pendiuu]

Well guys I finally found the problem.....electric stuff in Toyota are tricky but with a lot of patience and a multimeter you can get to it.....well first of all I striped the wire hardness going and coming form alternator/battery/voltage regulator. Got my multimeter and started checking for continuity...well found a fried wire so replaced it no problem.......but the problem was still there......When back to multimeter and check for voltage coming from alternator and voltage regulator....it was the same so I knew that voltage was not been regulated at regulator.....so open the regulator and it was burned inside so my problem was a combo....anyway replaced the regulator and presto problem solved.......I hope this helps anyone out there with the same problem....thanks a lot for the inputs guys