SOHC.co.uk Forums > CB750

Battery not charging - what else to check

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Underdog1:

--- Quote from: kevski on September 29, 2018, 09:52:23 PM ---I recently sent 3 RR24 reg/rec's back to M&P's all of them not working correctly, got a refund in the end, i then got a UK made RR24 from elcterexworld, more expensive but worked correctly from the moment i fitted it, seems there is a dodgy batch at M&P and they are happy to keep selling them, when i get things like this i only cut the corners off of the bags they are in just enough to get the plugs out, i then test run them, the reg/rec's never leave the bag until i am sure they are good.

--- End quote ---

Did cross my mind it could be the reg rec. is there anyway to benchtop test them?

I suppose if I test the stator is working then by process of elimination it must be the reg rec. Am I able to unplug the stator connector and with the bike running test AC voltage across pairs of the yellow wires?

kevski:
You can, test the 3 coming out of the stator like that, and the voltage coming out is the same plus or minus a volt or two, just make sure your rotor is powered up as well.

Underdog1:

--- Quote from: kevski on September 30, 2018, 07:10:07 AM ---You can, test the 3 coming out of the stator like that, and the voltage coming out is the same plus or minus a volt or two, just make sure your rotor is powered up as well.

--- End quote ---

As in rev the bike over 2k rpm?

Bryanj:
No you will need to put battery positive voltage to rhe white wire and earth the green one to power the field coil then with engine running you should get AC across each of the 3 pairs of yellow wires

Underdog1:
Tried a different (electrosport) reg rec and had no success. The bike lives on an oximiser now butdoesnt seem to have enough juice to start off the e start ever always needs kicking, voltage is IIRC 12.8ish when the oximiser stops charging. When I used an old school battery charger in it the battery charged all the way to 15v (which I’m unsure if this is good or not) and spring to life in milliseconds on the e start


--- Quote from: Bryanj on September 30, 2018, 10:20:03 AM ---No you will need to put battery positive voltage to rhe white wire and earth the green one to power the field coil then with engine running you should get AC across each of the 3 pairs of yellow wires

--- End quote ---

Should have probably done this first..

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