S2 Charging

[jims2]

Hi, not been on here for quite a while but hoping i can get some help with my S2 charging problem. Trying to get car ready for MOT after a bit of long rest and i cant get the charge light to go out. Have checked wiring and connections but without luck i dont think its the alternator itself but any suggestions where i should look next ?

Jim

[GadgeS3C]

jims2 said:

Hi, not been on here for quite a while but hoping i can get some help with my S2 charging problem. Trying to get car ready for MOT after a bit of long rest and i cant get the charge light to go out. Have checked wiring and connections but without luck i dont think its the alternator itself but any suggestions where i should look next ?

Jim

Apologies for asking (grandma and eggs!) but you have revved it over 2.2k? Not sure on an S2 but my S3C needs about that mnay revs before the charge light goes off.

[Julesprivate]

Why don't you think it's the alternator? That suggests you've already done some tests - what have you done so far?

Have you checked the battery voltage with the engine off (~12V) and then with the engine on (you may need to blip the throttle once to get the exciter circuit to fire) then you should have ~13V at idle and anything up to 14.5V at higher revs...

[Griffinr]

Julesprivate said:

Why don't you think it's the alternator? That suggests you've already done some tests - what have you done so far?

Have you checked the battery voltage with the engine off (~12V) and then with the engine on (you may need to blip the throttle once to get the exciter circuit to fire) then you should have ~13V at idle and anything up to 14.5V at higher revs...

If that doesn't work try removing the diode from the back of the alternator and check that the carbon brush is free ( it's spring loaded) they sometimes stick with non-use.
Rob.