1972 Chevy Nova Alternator Replacement - Mr. Amp - CHP Step By Step

Since the stock alternator utilizes a smaller mounting hole than the Mr. Amp alternator, we used the sleeving kit (provided) so that we could still use the stock mounting bolt. We installed that bolt through the alternator and threaded it into the cylinder head. We locked it down snuggly with a 9/16-inch wrench.

Next, we located a position on the firewall for the thermal circuit breaker and fastened it down using some machine screws. Then we cut the 6-gauge wire to length. We ran enough cable from the battery to the thermal circuit breaker and then from the circuit breaker to the back of the alternator. Crush-type terminals are provided and we put those on each end of the bare wire as well.

Starting from the battery, we ran the 6-gauge wire through the passenger-side fender and toward the firewall. There we connected the terminal to the thermal circuit breaker using a 1/2-inch wrench. We followed the same steps to attach the other end of the wire from the thermal circuit breaker to the back of the alternator.

Our Mr. Amp comes with a new three-wire plug. We followed these simple steps to wire up our Mr. Amp.

a. Yellow wire with White stripe: connects to the positive post on the back of the alternator. We looped this wire over to the threaded post where we attached our main positive battery cable.

b. White wire with Black stripe: Connects to the single solid White wire pigtail that we plugged into the alternator.

c. Green wire with Red stripe: Connects to a 12-volt ignition source that is "hot" only when the key switch is on. Note: If you have an idiot light on the vehicle, this wire must be connected to it for the light to function.

Using the three-wire plug, we attached it to the back of the alternator. In our case, the plug was simple to reach however it may be wise to attach this plug before the alternator is installed into the engine bay.

With the wiring complete, we double-checked our work, making sure all the connections were solid and tight. Then we attached the 6-gauge wire to the battery terminal.