We had a 2007 Superformance GT40 (a recreation of the original GT40, made in South Africa) in our shop for service and a charging system problem. It’s basically a street legal race car. The alternator would have required about ten hours of labor to replace as this is a mid-engine vehicle with the alternator mounted against the firewall and down low by the driver’s side frame rail. We tested the alternator and found it to be working when the alternator regulator was bypassed. The regulator was easy to remove (two hours) and the alternator was fairly new, so we replaced just the regulator. The system is charging correctly and the customer is happy. Here are a few pictures of the car and the alternator location.
You can barely see the alternator, hidden under the headers and blocked by the frame from underneath
This view is from underneath the vehicle. There’s just enough room to test and replace the voltage regulator.
This view is from beneath the car. There’s almost no room between the engine balancer and the frame.