SOHC.co.uk Forums > CB750

Field Coil/Charging problem...

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BigAl (Alan):
Hi James,

Its possible the combined rectifier/regulator is faulty? or the battery voltage is high, therefore the voltage regulator would switch-off as normal.
Try leaving the lights on for a while to reduce the battery voltage, the regulator may switch on at the combined R/R spec (none Honda component, not sure what this would be?)

JimJam:
Hi Alan,

Yes, I have tried that. The battery voltage even dropped below 12v and still nothing.

After about 5 minutes of riding the battery voltage is under 12v and and the bike starts to misfire.

The RR is an electro sport. Not cheap £65. I think I will have to order another and see if it solves the problem. If so I’ try and get my money back on the faulty one.

AshimotoK0:
Do you still have the original fitment electromechanical one to try? Personally I never had any probs. with the original one and I had a succession of 4 off 400/4's 'back in the day'.

JimJam:
Sadly not. The bike had been sat outside for 10 years and the majority of parts were not salvageable. None of the original wiring or electrical components remain.

It has been a fair old challenge and this (I hope) is the last hurdle.

Here is a picture.

Bryanj:
I have seen a lot of combined units go duff, it only takes a fraction of a second of incorrect hook up to total them

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