Hi 

My S type has just had its radiator re-cored and water pump re-furbed.  It and has come back with the ignition light permanently on, after I start it,  and the battery discharges when i put the lights on.  How can I test the Dynamo, which has the power steering pump on it?

Paul

I suppose only 2 things can go wrong, possibly 3.

1, they havent put the belt back on, or failed to tension it properly.

2, they have dislodged or failed to reconnect the wiring at back of alternator.

3, alternator is kaput.

You would need a volt meter to check what charge is being sent to the battery.

Thanks Steve  I'll have a look