SOHC.co.uk Forums > CB500/550

Was over charging now under. 16.7v to 12.2v

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totty:
EDIT first post relates to over charging, later posts relate to under charging after fitting combined reg/rec.


I'm waiting for a combined reg/rec to arrive. I've read that they're easily fried, so I'm wondering if there's any tests I should do before fitting it?

The current status is 16.7v across the battery at 3,500rpm, the rectifier has a terminal snapped off and the potting compound gouged out to remake the connection, the red/white wire had at some point been replaced bypassing all plugs and its insulation is burnt. I figured it was a good time to fit a modern combined unit. The burnt wire has been cut out and replaced. The battery a recent motobatt still seems OK, but I doubt it'll last as long as a one not subjected to this. All other connections on the panel and in the headlight look fine, no sign of overheating. The bike wont be used until fixed, I don't fancy letting the smoke out of the wires.

Thanks

Allan

Gixxer-18:
This'll help, it's for British bikes, but it will work on Japanese ones.
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totty:
Lucas, the prince of darkness, I needed a couple of those jars when I owned Scimitars :-)

Good old 3 position switches - smoke, smolder and burn.

totty:
After fitting the combined unit:
12.18v to 12.24v dependent on revs.
Turning on the lights lowers it to 11.84 rising with revs but only to hitting around 12v at 3,000rpm.

So it's too high with the old parts and to low with the new.

This isn't making much sense to me, unless both are faulty. I can't see there being an issue on the AC generation side of things or it wouldn't have had the capacity to over charge with the old parts. With one plug and two wires all with matching colours connecting it up wrong seems unlikely.

Battery seems good 12.64v when I started working on it today.

Any ideas?

Johnwebley:


  how are you getting the readings?

 if you just put the probes on the battery terminals,you will just get battery voltage,

 if you want to check charging rate,you will need to check between reg unit and battery,

 

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