Thread: Battery light stays on

definately the 2 " lift Kit did it !!!
altered the level of electrolyte in the battery sending a residual current to the Tacho phase tapping wire therefore sending a charge into the field sensor wire .Obviously no longer firing the bridge rectifier causing the Zener diodes to turn into a Triode ! WHADDAYARECKON !!! LMFAO
PS hows that battery isolator wired , this "switched off the isolator" bothers me !!!

Originally Posted by 400HPONGAS

PS hows that battery isolator wired , this "switched off the isolator" bothers me !!!

Yer onto something here, the isolator must be back feeding the ignition/charge light circuits. Did you wire it to the charge light connection on the alternator perhaps? I thought it would be wired to the ignition switch output under the dash, so as the isolator doesn't overload the circuit. Get a pro sparky to have a look at how it is wired maybe.

Oknow guys very funny about the lift kit. i just thought i would fill ya in on all the things i have done to give a clear picture. one more thing i may add is i have also fitted a cb radio.

Any how i am thinking since i have added all the extra accesories the alternator was struggling and the rectifyer has packed it in, as the light goes off when driving then comes on when switched off also maybe the hot weather may have somting to do with it too.

I am actually a sparkie ( not a auto electrictian) and have fitted the same dual battery systm to 3 of my other cars and never had a problem b4

i have fitted a marine grade battery isolator with batt 1, batt 2 or 1 and 2 together and off same as in other trucks. hence this is where i can completly isolate the 2 batteries. i have a 70 amp alternator so me thinks its just too small and its just had its day. but open to other suggestions.

Since this morning i have had time to play with the car and geting no voltage from the alternator but will take it to a auto sparkie to be sure on monday .


What gets me is why has the car been fine for a few weeks then now packs it in?

suggestions please.
Will.

Ok had some time to pull the alternator out and test the diodes. They all seem fine. Then I pulled the alternator apart for a clean and degrese and then put it back in the car. Now the light does not come on, great ? i have fixed it i think. but now the battery light is now on when the engine is running and off when switched off the complete opposite . i am now leaning towards the voltage regulator as i think the alternator may be over charging the battery?

Does any one know how to test the regulator or what else it could be?

Cheers
Will.

Will,

it has been my experience in this case that the rectifier is faulty, specifically an exciter diode as it will stay on when ignition is off. The change in symptom after a cleanout could still mean a rectifier fault unfortunately.

Sometimes this is too costly to repair and another alternator is the cheaper alternative.

JC

:
"What gets me is why has the car been fine for a few weeks then now packs it in?"
Perhaps with those real old school Col Herse switches , maybe , just maybe , the switch passed through the NO battery position while the engine/altenator was running . That will do to your altenatot exactly what you are experiencing , thats if you are indeed switching Positives