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Build a Synchro rectifier for Onan CCK??
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Heliarc View Drop Down
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Joined: 23 Jun 2019
Location: Shickshinny PA
Points: 42 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Heliarc Quote  Post ReplyReply Direct Link To This Post Topic: Build a Synchro rectifier for Onan CCK??
    Posted: 9 hours 28 minutes ago at 7:48am
I opened up the old rectifier from an Onan. It was epoxy potted. I was able to put it in boiling water and carefully pick the epoxy away. Not sure what I'm looking at exactly. I figure the white wire is an output and the two black wires are inputs. Black wires (AC) go into two diodes, then out (DC) through the white wire? I figure a guy that knows anything about electronics could build this no problem and for only a few dollars. If anyone on here knows just what this stuff is I'd love to know as well.
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Codger View Drop Down
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Joined: 23 Dec 2020
Location: Utopia
Points: 2329 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Codger Quote  Post ReplyReply Direct Link To This Post Posted: 6 hours 53 minutes ago at 10:23am
You have a half wave rectifier there. Two diodes mounted to a metallic plate which serves as a parallel anode connection, and heat sink to pull the heat away from the diodes. Assembly should be mounted in the airstream of the flywheel cooling fan.  Replace both diodes with 20A units paying attention to the direction. When you impress more positive potential upon the cathode than the anode, the diode conducts rectifying the output through the white wire into a very noisy output DC voltage; good enough to recharge a starting battery. 
That's All Folks!
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 86074 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 19 minutes ago at 12:57pm
the ones i am familiar with are on the old BRIGGS engines.. ONE WIRE from the alternator goes into the two diodes... One diode changes to DC to charge the battery.. The other DIODE changes to DC to feed the head lights... Head lights dont work off the battery...
Like them all, but love the "B"s.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 86074 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 3 hours 58 minutes ago at 1:18pm
have also seen  Two alternator wire in and ONE 12v DC out put...




Edited by steve(ill) - 3 hours 42 minutes ago at 1:34pm
Like them all, but love the "B"s.
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
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Points: 86074 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 3 hours 41 minutes ago at 1:35pm
several variations over the years and depends on size of engine / stator..
Like them all, but love the "B"s.
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