T-Mack1 Posted April 4 Author Share Posted April 4 On 4/3/2025 at 8:17 PM, Geoff Weeks said: Post your solution to the selenium unit when you get to that point. Will do. I have been talking with my buddy who is most likely a genius that never went to college. Machinist, Top 50 GM mechanic at one time, and Electronic GURU. I had him look at all the options including using the more modern Leece Neville rectifiers (one Pos one Neg. ). His opinion, since the selenium rectifier has significant resistance forward, one of those 3-phase rectifier modules would be a big improvement. He said get one that is rate higher than the alternator output. 120A at a minimum, for our 100A ALT. Also said get the lowest voltage one you can get. So, after he looked at the spec's of one I found, we got a 800v 160A bridge rectifier module. I just have to build a heat sink for it. Again, working with him on size for it. He said that we should see slightly higher charging AMP's and at a slightly lower RPM. EDIT: the bolts on the module are M6-100 which is nearly equivalent to the 1/4-28 bolts used on the Selenium rectifier. Quote Link to comment https://www.bigmacktrucks.com/topic/75276-former-boston-fd-b85f-1211-project-mack-brothers/page/2/#findComment-572804 Share on other sites More sharing options...
mowerman Posted April 4 Share Posted April 4 Excellent thanks for sharing. Nice going bud…. Bob 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75276-former-boston-fd-b85f-1211-project-mack-brothers/page/2/#findComment-572809 Share on other sites More sharing options...
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