Topic: CB750F1 with M-unit charging system

[tomjoz]

Hi Guys,
quick question, how can you test if the charging system is working as required? I just replaced the whole electric system with M-unit, new Ricks Reg/Rec new Li-Po battery all new wires etc. I connected everything and the electrics run well but I'm not sure if the battery is charging (I've checked the battery terminals with a voltmeter). Is that correct approach in that case? 

Cheers

[calj737]

The mUnit has nothing to do with the charging system. Key OFF, meter at battery terminals, what’s the voltage? Key ON, engine at idle, voltage at battery? Engine running, 4,000rpms, same test at terminals?

[tomjoz]

The mUnit has nothing to do with the charging system. Key OFF, meter at battery terminals, what’s the voltage? Key ON, engine at idle, voltage at battery? Engine running, 4,000rpms, same test at terminals?

Will do and confirm
So I wired my new Req\Rec through MUnit so I thought this could have impact on the charging system?

[calj737]

How exactly did you do that?

[tomjoz]

According to the attached diagrams from Revival:
1. Starter selenoid
2. General MUnit diagram
3. Rec/Req with Munit

[calj737]

The BLACK wire from the RR is only a reference voltage for the Regulator side. As long as the output of the mUnit on that terminal equals the voltage read at the battery directly, you're fine. Proceed with the tests listed above.