Hi All, recently my battery warning light has been coming on at the beginning of some trips and a few times during driving. When it does it also stops my CD/radio. Motor seems to crank strongly enough and lights are fine.
Does this mean my alternator is not charging while the light is on? Could it be that it just needs new brushes?
ive found that if it comes on at the beginning of the trip then goes away after driving a couple minutes, it means that the brushes on your alternators voltage reg are only making a connection when everything warms up and expands. new voltage reg is $50 or so and is easy to change out.
heres the thread i started on this problem..
VP Calais battery warning light, wiper function ect... im stumped
dont sweat the petty... pet the sweaty...
Seeing as it also stops your CD/Radio I would be checking the earth wire from the battery to body of the car, it's a black small wire coming from the battery and screwed to the body panelling usually close to the battery.
Make sure it has a good connection to the body even if you have to remove the screw and scratch the metal where it touches the panel.
You dont have brushes on your voltage regulator :\
Check the output of the alternator @ the back of it with the car running. should be upwards of 13volts.
1999 LS1 VT SS
1991 VN LS1 Conversion under way
1992 VP Berlina
My first thing would be to grab a multimeter and check the voltages like Alloytec said. (If you don't have one they're pretty damn cheap & very handy). Can also check voltages across the battery and earth too, but I doubt that's the problem. Had issues with my earth wire, and the main problem was starting it. I could use jumper leads to make an earth to the block to start it, then it'd run. But it'd sometimes just stop when slowing right down (like entering servo/roundabout).
will follow up on those suggestions. I do have a multimeter just been too lazy to take it out to the carport. I presume there are brushes in the alternator and this is what ryder is referring to. Sounds like a quick fix but check earth connections first.
can also mean the regulator is faulty, recently replaced the brushes on mine (fixed the issue of the alternator not working at all).
Now occasionally the charge light illuminated while driving so i rechecked all the wiring and handy work, noticed a strong smell of a battery over charging so grabbed the dmm and started driving around with that in the passenger seat..... the alternator was pumping out 17 volts occasionally.... was a bugger to catch and measure cause it'd only come on sometimes and wouldn't stay on long enough to diagnose properly, another reg and it's fine now.
EDIT: this is the most common and likely fix for intermittent alternator light. If that doesnt work, could easily be the diodes in the alternator.. in which case you pick up a secondhand alternator for another $50 and stick your new reg pack into that.
The radio cuts out when it happens?.. thats a worry. You mean just radio or big amps? Does anything else cut out, or the engine miss or anything when this happens? If the radio cuts out, but nothing else does, when and only when the light comes on, you might be better off looking at your radio/amp wiring first..
Last edited by DAKSTER; 15-04-2012 at 01:19 PM.
It's just a Kenwood tuner/CD. No extra amp. Doesn't affect the way the car runs. A couple of times the CD stops or radio goes off and I look down and see battery warning light on. Hmmm.... self installed CD player? Don't really want to chase that wiring but don't want to fry CD or car either
Good luck figuring it out, last electrical issue I had took an RACQ guy, 2 different mechanics and 3 different auto electricians before it was sorted.