The only other thing I can suggest is to be sure the fresh air tube is in place. That draws cooling air over the aluminum fins of the heat sinks inside the computer.
You might consider having the alternator load tested. If it shows "ripple" is very high, and the most output you can get is one third of its rated capacity, (30 amps from the typical 90 amp alternator), it has a bad diode. The voltage regulator would cause higher than normal field current to flow continuously in an attempt to raise the output current to meet demand. We're only talking about increasing field current from an amp to as much as three amps but that might be enough stress to eventually cause a part to fail.
These voltage regulators really are very trouble-free so you have to look for some unusual cause to the repeat failures.
Please consider a to help us answer more questions.
Tuesday, July 10th, 2012 AT 12:15 AM