SOHC.co.uk Forums > CB500/550
550F charge issue?
Sesman:
Like i mentioned, visual/physical check of all connections especially the rectifier and regulator ground/earth. If you intend to substitute devices from a donor I’d start with the regulator (field control) then the rectifier.
Most likely problem is a poor ground/earth for either the field coil, regulator or rectifier.
McCabe-Thiele (Ted):
Not sure what impact a failing battery has on the voltage output but below is a little account of a battery failing in a car.
In 1974 I was taking a prospective buyer for a test drive in a brand new red Opel Ascona in Burton on Trent, I was held up at a set of temporary traffic lights on Balaclava Road opposite the Shell Station. As I started to move off when the lights changed to green the engine started to loose power it stalled - I saw smoke coming from under the bonnet edges so switched off the ignition and we alighted from the vehicle.
Vehicle was towed back to base and the battery had failed due to a dead cell short. New battery fitted & everything was okay - customer decided to buy an Audi 100 from me instead!
K2-K6:
Yes Ted, a dead short is always going to be problematic ;D as there's quite a potent energy stored in there to make fire with ;D it's usually the result of physical damage though to get that.
If you loose one cell it tends to be below eleven volts (missing two from 12.6 gives 10.6) is a good indicator. In the eleven range, they're usually OK but can be toward end of life or just reasonably discharged from not have alternator input.
deltarider:
Here's a little anecdote about how to make it home with a dead battery. Enjoy. http://forums.sohc4.net/index.php/topic,164389.msg1914136.html#msg1914136
McCabe-Thiele (Ted):
Back in the late 1969/70 I had a battery fail on my Honda 250 Dream - at that time the only option was to buy one from a Honda dealer iirc it was £34.00 (3 weeks wages) for a replacement.
I cut around the top of the battery to separate the top section from the casing - pulled out the top - a load of what looked like thin sheets of glass fibre started to fall out from between the battery plates. I pulled them out & binned them washed out the sediment in the bottom as well as dipping the top with the plates attached into some clean water. I Araldited the top back on and filled with battery acid & put it on trickle charge overnight.
Incredibly the bike started first touch of the button, when I sold it six months later to a mate - I told him to never let it go flat - about six months later he let it go flat so had to fork out for a new battery.
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