99 mk 5 95 amp alternator problem

[dick]

hello all, the charge light on the dash doesn't come on at all, although the alternator does not charge , i've swapped it out for a spare i have but still nothing, i've tested the bulb and its good, i have 12v on the ribbon to the bulb and have 11v the the other side of the bulb, but i guess this should be earthed ?? to light the bulb, on the alternator what do the two wires on the push connector do, cheers

[gotgcoalman]

Mine packed in yesterday.
No light on the dash to indicate low charge.
Is yours like this one with the 2 wire plug ?

altt.jpg~original.jpg

Volt meter in cab showing battery voltage and dropping as brakes and indicators were used to get home.
At 1 point it started charging 13.8v shown on the volt meter.This was short lived
got home and battery showed 12.1v.

Alternator dropped off at auto electric place for diagnostics/repair.

replacement is between £100-£140 new

I'll find out tomorrow if it's beyond economic repair

[dick]

yes thats the one, no charge out of it at all, i did fit a recon one but that was the same, i thought it was a duffer but now think its Something more????

[dick]

i can't get the fact that the charge light does Nothing ??

[gotgcoalman]

Can't remember off hand.
but
regulator/rectifier/diode in the alternator controls the charge/low charge light.
If that goes then the bulb won't light up.
Could also be fuse/wiring

[Bruce e]

Could be the small wire from the battery to the alternater that supplies power to excite it so it works. Had the same problem with a Hino truck

Sent from my SM-G390Y using Tapatalk

[gotgcoalman]

Just been on to auto electric place.
Regulator is fubar.
testing + repair £60.