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Old 11-24-2019, 02:05 PM
Terry M. Hunt Terry M. Hunt is offline
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Join Date: Feb 2002
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Default Which diodes go where?

Have my 55 amp alternator disassembled for a rebuild. Removed 3 diodes from the end frame and 3 from the heat sink. After examining all 6 closely I can’t find any indication of which ones are positive and which ones are negative. I will be replacing all the diodes and hope the new ones I buy are marked positive and negative, but still not sure which ones go in the end frame and which ones go in the heat sink. I’m guessing the 3 positive go together in one place and the 3 negative go together in the other place, but which goes where?

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  #2  
Old 11-24-2019, 03:08 PM
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Peter Serio Peter Serio is offline
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Default Diodes.

Probably should have tested them using a multi-meter on the Diode setting before pressing them all out of the heat sink. Make a hand drawn diagram of how all of those go back in.
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  #3  
Old 11-25-2019, 07:14 AM
stellar stellar is offline
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Default

Neg in end frame and pos in heat sink. Usually they are marked red being pos and black being neg. I hope you have all the insulators in order. If you need them I have them and the capacitor with the lock ring
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