My alternator is kicking out upwards of 18 volts at speed and tripping out my Pertronix ignition. I think it has fried the external regulator as well which was new.Any advice on fix or is this a case of just buying a new alternator.The battery is sitting at 13.8 volts.

Its the regulator that regulates the voltage if you know what I mean. Sounds like the new external reg could be faulty.

Had this happen twice over the years, bought about by using an LED bulb as the tell tale on the dash I have sine learnt.

Don't use it until fixed as you can boil the battery acid.......

Chad

Its the regulator that regulates the voltage if you know what I mean. Sounds like the new external reg could be faulty.

Had this happen twice over the years, bought about by using an LED bulb as the tell tale on the dash I have sine learnt.

Don't use it until fixed as you can boil the battery acid.......

Chad

So would it be better to change the alternator with inbuilt regulator or just chance that the next external reg doesn't get killed. Could it be the alternator at fault?

personally I would change alternator for one with built in reg as its less wiring and regulator is not exposed.

personally I would change alternator for one with built in reg as its less wiring and regulator is not exposed.

Sounds like a plan

The voltage regulators for the type 4 engines are sealed plastic ones now and don't usually give problems. The type 25 alternators have built in regulators but I don't know if they do built in ones for yours, if they do; I bet they are expensive. I would go for another external regulator.

Rob

Used one of the plastic external ones in the summer to replace a genuine vw one that was only just reaching 13v at times so far new one has been good as gold.

Check the wiring connections are sound and it is not loosing the supply from the ignition warning light where it senses the voltage.

Used one of the plastic external ones in the summer to replace a genuine vw one that was only just reaching 13v at times so far new one has been good as gold.

Check the wiring connections are sound and it is not loosing the supply from the ignition warning light where it senses the voltage.

So if it was losing the supply from the warning light that could cause it to over volt?

The voltage regulators for the type 4 engines are sealed plastic ones now and don't usually give problems. The type 25 alternators have built in regulators but I don't know if they do built in ones for yours, if they do; I bet they are expensive. I would go for another external regulator.

Rob

Its got the CSP conversion so takes a normal type 1 alternator

Clive, Stonebridge Autoelectrics near Werrington can test the alternator and regulated for you. They're currently reconditioning my alt and they're going to test my regards with it when I collect it. Speak to Robert there. 01733 810121.

Clive, Stonebridge Autoelectrics near Werrington can test the alternator and regulated for you. They're currently reconditioning my alt and they're going to test my regards with it when I collect it. Speak to Robert there. 01733 810121.

Ok cheers, will give them a try

The voltage regulators for the type 4 engines are sealed plastic ones now and don't usually give problems. The type 25 alternators have built in regulators but I don't know if they do built in ones for yours, if they do; I bet they are expensive. I would go for another external regulator.

Rob

Its got the CSP conversion so takes a normal type 1 alternator

I've not seen your buggy in the flesh, I remembered you had a type 4 engine in it but didn't realise you had a CSP conversion on it

Rob

So if it was losing the supply from the warning light that could cause it to over volt

No... as I understand it, unlike a dynamo that is just a motor in reverse, an alternator needs to "see" a voltage in order to "excite it" and produce output.

Problem is I have seen all sorts of electrical issues over the years, not just relating to vehicles either, that defy any theory.

Once it is charging an alternator will still give out charge it need exciting to start charging.

agreed Keith..