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cb550 charging system fault

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bigmockuk:
hey everyone,ive had this cb550 k3 (77 plate) for like 10 yrs ive put up a few posts in the past about it,well,thats me finally got my full licence (long story lol) but i had the chance to get this bike cheap at the time so grabbed it,was great to finally get it out on the road and ive done bout 130 miles,problem is the battery was badly heating up! i got an upgraded reg/rec years back and it never worked,got a new one delivered today....and it doesnt work either.ive been using the old regulator to fire up the field coil and charge the system,obviously its too high but no matter what i turn it down to,the charging wires from the rectifier heat up a lot!i renewed the main harness and the sub harness a while back but feel the wires on the subharness (the ones that are overheating ) are so flimsy compared to the old heavier originals,could this be the reason ? any thoughts anyone has would be appreciated thanks

Bryanj:
Too small wires will overheat but you need to do some testing.
With ignition on put neg lead of multimeter to neg of battery then with pos meter lead check volts at pos battery and black wire at reg, any more than0.5 volt difference you have a problem

Do this with kill switch TURNED OFF

bigmockuk:
thanks bryan i`ll do that in the morning.any idea why that new reg/rec didnt work? could it have blown instantly?

Bryanj:
Split second of incorrect wiring will blow it

Gromitdog:
Hi Big Mock
I had a charging problem on Mutely the Honda after I did a wiring loom replacement It took a couple of hours to find the fault and it came down to the  connector on the stator it has a slight long spade on the original loom. Just carefully took it apart then re crimped.   -    jobs a goo-den 🤗

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