sorry for hijacking thnis thread but i have the same problem.

i measured the dynamo and it gives me 2volt at high rpm. I think it should give at least 13volts, isn't that right ?

Update - Bought a new battery today. Its now starting fine. However, my wipers are still quite slow. I don't think its my imagination... They usually speed up a little bit when you rev the engine. They don't.

Have you got a voltmeter?!
You cant gauge whether the battery isnt being charhed properly by slow wipers, for all you kno it could be a partially siezeing wiper motor or spindle slowing the wipers down

Buy a decent multimeter, you can pick up a sealey one for about 35 quid and itll do everything you would ever need it to do!

Will it suck you off then?

Yes I've got a multi-meter but it ain't working so I'll go round to me electrically minded bastard of a grandad later to check all is well.

Ok cool
Should be chargingvat 13.4v IIRC
as the revs rise from idle the voltage wikk rise hopefully

If you have the old adjustable style reg still, break out the haynes manuel if its out of whack
Its a piss 'oh piss

Hi James,
14.4 volts maximum.

Too much can be worse than not enough, as it may cook the battery.

ken