Griff 500 alternator not charging

[Gadaffi Duck]

Just a quickie:
Turn ignition on, no red light on dash so alt not charging batt. Will start charging when i give throttle a blip (2500 rpm or so). Bit of wire from earth to brown contact on alt gives red light.
What do we think, chaps? Alt or wire prob?
Ta

[Ant.]

Aye up duck, ow at?


Possibly the 100 amp fuse(s)? or the regulator pack on the alternator?

[2mad]

hi have you checked the tension on the alternator belt could be slipping
at low rpm

[Gadaffi Duck]

Ant. said:

Aye up duck, ow at?


Possibly the 100 amp fuse(s)? or the regulator pack on the alternator?

Eyup, Ant. I'm ow rate. yourself?

Might take alt off and get it checked. Not a major prob, more of a pain in the arsenal. Just thought i'd throw it over to the masses before I did it.

Edited by Gadaffi Duck on Sunday 17th May 12:05

[Gadaffi Duck]

2mad said:

hi have you checked the tension on the alternator belt could be slipping
at low rpm

Yes, checked that, matey. Prob is that red light not on even with engine off/ ignition on.

[tubbystu]

Ant. said:

the regulator pack on the alternator?

Failure of regulator pack usually results in dash light being on permanently (well when the key is in and turned to position one or further obviously.......) IIRC

[GreenV8S]

Gadaffi Duck said:

Just a quickie:
Turn ignition on, no red light on dash so alt not charging batt. Will start charging when i give throttle a blip (2500 rpm or so). Bit of wire from earth to brown contact on alt gives red light.
What do we think, chaps? Alt or wire prob?
Ta

If it charges OK and doesn't flatten the battery after you switch off then you know there's nothing drastically wrong with the alternator. The current through the no-charge warning light is used to bootstrap the field coils. Without this there should be enough residual magnetism in the alternator to energise it but it will need more revs. From the symptoms you have I would suspect that the no-charge warning light has failed or got a wiring fault, and this is causing the problem.