Replaced alternator brushes - now what ?

vsv8berlinawag · #1 08-08-2006, 09:05 PM

Battery light still comes on occasionally i.e. nothing changed after putting in a new set of (V8) alternator brushes last weekend. Time for a new regulator and how much are they or could the battery be rooted ?

TheForgotten · #2 08-08-2006, 09:32 PM

could be a few things - check the battery with a multi meter, with car running, check volts, should be around 12.2-14.4 I think, and with car switched off, should read no lower than 10
could be the voltage regulator - prety sure it won't run at all if the reg's stuffed
could also be the diode - if the diode's stuffed, a brand new battery can go dead overnight.
other than that, I could only suggest poor/old wiring

hako · #3 08-08-2006, 10:29 PM

Usually the regulator is replaced when the brushes are replaced as they are cheaper that way ($40-50) and they both can cause the battery light to come on. At idle with no accessories or lights on you should be reading at least 13.5V and with the engine switched off after sitting for an hour or two or overnight it should not read below 12.6V.

Patrio7 · #4 09-08-2006, 03:13 AM

water in battery topped up? my battery light came on a while back, battery was pretty low, topped it up, took it down and back up the freeway, all good.

vsv8berlinawag · #5 09-08-2006, 09:09 PM

Thanks for the replies. I ended up getting a new reg set for $45 from my local Holden dealer. I replaced it tonight without taking the alternator out in around 15-20 minutes (

). Hopefully that's it for now and the bat light stays off. Cheers !