After driving for 5 or 10 minutes the ABS light and red charging light both come on. After that they'll stay on most of the time but do sometimes go off and then on again. There are no ABS or ECU fault codes and it continues to charge even though the lights on. I've checked connections and earths and can't see a problem.
Looking at the circuit the lights do seem to be connected and linked to a 'sensor resistor'. I think I've found the resistor in the relay box on the drivers side wing - but what does it do?
My guess is an alternator problem when it warms up???