SOHC.co.uk Forums > CB500/550

rectifier help please

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neat street:
Hi All, looking at trying to clean and test this unit from my 500. any ideas on how to do both please? I have tried contact cleaner but did not even touch it. thank you, John.

exvalvesetdabbler:
Looks like the original lacquer on the board has been 'got at' .  Need to get it off with acetone or paint stripper, clean the board and apply some PCB lacquer.

I would do be inclined to test it before cleaning.


The following assumes it's a 3 phase rectifier, 3 yellow wires, green chassis and black +12v.

To do a basic test you will need a multimeter with a diode test setting.

From each phase you should get 0.6 to 0.7 forward voltage drop ( red test lead to each yellow and black test lead to black) and open circuit if you reverse the connections.

Do the same for ground wire (green) to each phase yellow . Red test lead to green black test lead to each yellow. Swap the test leads around an you should get open circuit  with each  of the 3 phases.

Regards
Dave

Bryanj:
Dave got his colours wrong,earth should be green and the positive to starter solenoid/ battery red or red/white BUT its old and dirty so all bets are off, take the ring terminal as ground along with the mounting bolt

exvalvesetdabbler:
I was struggling to sort out the colours there.

According to the schematic it could be a red with white tracer wire running back to the starter solenoid where it joins the red wire on its way to the main switch.

Sometimes a cotton bud with cif cream on it will sometimes shift a bit of grime to reveal the main colour and tracer.

My colour vision test has expired now and won't be done again  since I have retired. Had to have it  to get authorisation to work on electrical systems. I was always borderline so got done every 3 years.

Regards.
Dave

Bryanj:
Dave, Honda dont tend to use industry "standard" colours like black for switched live and green for ground plus after 50 years of added aditive(sh1te) its very difficult to tell.
Having been brought up on St Joseph Lucas, prince of darkness, electricals fault tracing becomes second nature!!

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