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Todd:
As far as the diodes are concerned, I replaced mine a few years ago with identical parts from Newark Electronics. Actually, the new parts had better voltage ratings. If I recall correctly, Cessna wanted several hundred dollars each for the two big power diodes. I got them at Newark for about $30 each. I will try to dig up my records and get the part numbers for you.
In regards to the pulsing lights, that is a common problem with the Skymaster. It is caused by your system voltage fluctuating up and down. This fluctuation is usually caused by resistance in the alternator field circuitry. First, try running on one aleternator at a time, in case the problem is in only one circuit. (Most likely it will be in both.) Check each connection point in the field circuit...The field circuit breakers, the alternator field switches, the connections to the voltage regulator, the master switch, etc. Clean them and make sure they are tight. If that does not cure the problem, then you may have to replace some of the components, particularly the alternator field switches, the master switch, or the circuit breakers. Even a very small amount of resistance in the field circuit causes the voltage regulator to call for higher voltage, and when it sees the higher voltage, it calls for less voltage. This cuases the system to "hunt" with the voltage spiking up and down. I had to replace the master switch and alternator siwtches in my aircraft to make the problem go away, even though they ohmed out OK. The good news is that the switches are cheap and easy to replace.
Mark
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Mark Hislop
N37E
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