Honda-SOHC
SOHC.co.uk Forums => CB500/550 => Topic started by: Johnny4428 on June 28, 2020, 05:57:45 PM
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Hi everybody, anybody cruising today? Went for a run just about 18miles switched to reserve fuel on my return to town so filled up, pushed starter button wouldn’t even turn over, thank god there’s a kick start lever. I came home checked voltage on battery 11.3 volts! Not good. No power whatsoever getting from alternator to battery. I have a suspect rectifier with a slightly fried red/white wire. Question is replace with just rectifier or replace with regulator rectifier. About the same cost wise from what I’ve seen so far.
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Im old school and prefer original to this new fangled electonickery.
Rectifiers rately go a used one will 80% be OK.
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On my 3 phase Suzuki gt550 I use a rectifier from fleabay for less than 3 quid. My 550K3 still has the original rectifier so I have not had to change it but it has the same wiring as the suzuki. 3 yellow 1 green and the Red/white?. Well the suzuki is just red. I have these fitted to all of the suzuki bikes and in 10 or so years not one has failed.
Its been a very cheap option. Fleabay item search Sql35a
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Thanks very much guys, that rectifier looks very interesting, anybody else tried one? I think at that sort of money you can’t go wrong. Seen a couple on dk spares but everything advertised 39.99 postage and they don’t use Royal Mail which is cheapest for sending to Orkney, especially something that can be slipped into a small Jiffy bag.
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I fitted a similar one only a 50A one as it had built in heat sink fins (about a fiver) to a CB400F and it seems fine so far.
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Fitted today, all seems fine, too wet for road test but passed garage run testing.
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Also to add to the discussion pot http://forums.sohc4.net/index.php/topic,183347.0.html interesting related thread over on the USA sohc site that could be of interest.
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That tie-wrap needs to be black Jonny
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Your absolutely right just doesn’t look right! Quick get the side cover on before anybody else notices.😂😂
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Them there’s the white heat shrink…
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Thought I did well finding bits and pieces of correct colour wire, unfortunately no green heat shrink. Added to shopping list along with black cable ties!!
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My 400 ground to a halt on the M4 due to a lack of volts. One of the terminals had broken off the rectitifer flush with the epoxy potting. I sharpened up a screwdriver and chiselled some of the epoxy away from the broken terminal so I was able to solder a new spade onto it. That was about 7000 miles ago.
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Good fix Mike! Was that a similar type rectifier? Wasn’t sure of the durability of these cheapo components. The temptation to spend £4 compared to £60 was overwhelming.😂
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Mine was the standard Honda item. The difference between the OEM one and what you've got is, maybe, the heatsink. Yours might run a bit too hot and break down. You can always add a heatsink to it if you think it's inadequate. With a smidge of heatsink paste.
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Thanks for that I did wonder about the heat side of it. I will keep an eye on it after a couple of longer runs, I will probably replace at some point with the correct item in keeping with the bike spec. (he says with his electronic ignition)🤫
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I made up several sets of replacement rectifiers years ago expecting them to fail..... Some with heatsinks and others without. Not one has failed. Not had a battery go flat either.
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Another useful thing from fleabay was a small digital readout. I put some long wires on and clipped it to the handlbars to check the charging voltage. Nice to see for a few days. All worked as it should with the new setup. They seem to be reliable
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That’s interesting to know. Had my first run out with bike this afternoon, checked rectifier on return and only slightly warm. Funny thing I was wishing I had a volt gauge on the bike to keep an eye on charging.
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Hi Johnny,
I had the same problem of wanting to know battery voltage on our MX-5 - the ECU does the regulating and they seem to charge at or near 15volts, which I am a bit uneasy with. Anyway, I bought a couple of very cheap voltage displays and fastened one to a cigar lighter plug to do some checking. You could easily adapt one of these with long wires to somewhere visible - even inside the side panel would give readings you could check occasionally.
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Ian
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Nice one Ian. 15v seems high! I actually have a small round double usb socket with voltage display I had purchased to fit to the Pan I possibly could do a temporary fit to the 550. Turned out to be nice day later on, didn’t expect to be out on the bike today but managed a run around. Cheers!
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Temporary set up to check charging circuit.
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That is very neat. I watched some of this guys engineering videos, he is a bit of a genius. I don’t think I’m even worthy of owning a hacksaw never mind using one after watching Allen in action.
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It was Amazon. Flip up the cover and it’s a double usb socket. Bought to fit on my Pan. I have an unmolested low mileage model so was reluctant to cut into the plastic. Might make a bracket or something. Really just purchased more for the usb sockets than the volt meter, but makes sense to have both.
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Those usb ports are great for charging the mobile phone. I keep a portable one in my motorcycle jacket so I can connect it to any of my bikes. Even charge on the go. Make you wonder how we manged years ago.
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Very handy! Do you just have clips on it to clip to battery terminals?
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Just use the croc clips to the battery. I'm sure a more sophisticated way could be done but it works for all the bikes I have. Its the purple thing in the pic. I think it came in other colours too. It does work!. I have charged the phone up several time over the years. Just get an data cable that suits your phone.
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It saves having to charge the phone before you set off.....
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Thanks guys for input and help! Bike is charging as it should so moving into phase 2 and going to spend another £4.
Flag connectors heat sinc and cable ties of the appropriate colour Steve. 😂😂
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Nice run out tonight 38 miles. Interesting monitoring voltage at battery during run. Had broad range from 12.4 to 15volts, I guess that’s the regulator acting on demand, mostly it sat at 14.4volts. Not sure if that would be normal.
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14,4 is perfect.