I recently installed a rebuilt Marchal Alternator and a used voltage regulator. It replaced a Motorola.
After doing the installation, and connecting the batteries, the alternator light went on. When I switched on the ignition, or started the car, the light goes off.

The voltage reg. gets extremely hot after a few minutes.

Where did I go wrong??

By the way, which Alternator is better Motorola, Marchal, Bosch?