Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Excessive voltage

Can anyone help
1998+4
Voltage too high from the alternator,therefore the battery light is not going out on panel lights
I have removed the alternator checked brushes all looks good the car has only completed 15,000 miles from new
Would I be right in thinking the voltage regulator has failed within the alternator
If so,where would I buy one

What voltage do you get and do you see the battery voltage with engine stopped?

Your assumption the regulator has failed is probably right but usually the light staying lit is a sign of too few, rather than too many volts. The reason I ask about the battery voltage is an alternator that has become electrically disconnected can soar in output voltage.

As for where to get one, just about any proper parts shop but as the Morgan installation may differ from other cars with that engine, make sure the new one has the same mounting points and spaces.

Certainly sounds like a voltage regulator rather than brushes as Martyn has said. You can change the regulator assuming you can get one but for the effort a reconditioned alternator is favourite.

Chris, have you checked the voltage across the battery with engine off and engine running - with a multimeter?

Many thanks for your reply
I changed the voltage regulator,thought I had solved the problem,came to the car following day to find the battery at 2volts. The following night I disconnected the connection of the alternator, the battery kept its charge perfect.
Next step was to change the rectifier,after talking to the supplier of the voltage regulator, he suggested I could go on spending money and suggested I bought a new alternator complete £105 including the postage. This I did, the car is perfect again, thanks for you help
Chris

In the good old days, (Lucas) alternators used to have a pair of diodes. One on the charging circuit and one on the warning lamp.
They often failed with similar consequences.