Topic: rectifier again....

[wilson889]

so, bike is a 75 cb750K, recently had a rectifier issue, bought a new one, from cb750 supply so its kinda aftermarket/newer tech, and it fried the metal clip that connects the ground wire to the screw that bolts into the frame where the previous one was installed.. 

so, is it another problem on my bike that is making it fry, or is it their part? I mean only the ground fried and was isolated to only their product.. I can upload some pics if your interested.

Thanks all.
Kevin

[TwoTired]

Did you test the rectifier? 
12 measurements.
Yellow to Red both meter polarities  Use the lowest ohms scale you have.
Yellow to Green both meter polarities  Use the lowest ohms scale you have.
Report findings.

Does the bike have stock wiring?

[wilson889]

Yes stock wiring. Everything was fine when installed. Everything measured our right as well.. ill have to get back to u on the finding now. The ground is fried from the rectifier, so not sure if it will give me a correct read..

[wilson889]

Ok, I am having recollections to when I first installed this new rectifier and I wanna say that the metal piece attached to ground was broke begin with.. I am hoping the place I bought it from will work with me and replace it. It shouldn't have blown and split a piece of metal along with the ground wire.. that's just crazy.

[TwoTired]

Electrical devices take an ambivalent stance with regards to hope.

[KingCustomCycles.com]

Electrical devices take an ambivalent stance with regards to hope.

Motorcycling is not inherently dangerous, but to an even greater degree than the sea, it is terribly unforgiving of any carelessness, incapacity, or neglect.  (old aviation quote but the principal is the same)

[wilson889]

Electrical devices take an ambivalent stance with regards to hope.

Well you guessed it, they will not warranty the part. According to them they wont even replace on if it was sent to u with broken parts.  A bit ridiculous if u ask me.. looks like they will not be getting anymore business from me..

Any body have a "working" rectifier they would be willing to sell?

[scottly]

so, is it another problem on my bike that is making it fry, or is it their part? I mean only the ground fried and was isolated to only their product.. I can upload some pics if your interested.

Thanks all.
Kevin

Yes, post pics, please. When did the frying occur? Immediately upon installation, after turning on the ignition switch, after using the electric starter, or after a long ride?

[Spanner 1]

Or after connecring a charger to the battery, backwards ?

[wilson889]

pics on the way, I am assuming the metal piece was broke before I even installed it, but with my ignorance I didnt Send it back then. So after installing it and going for a ride, towards the end of the ride I noticed something was burning(little smoke, it was dark and cold lol) i figured it was nothing.. then when I was about to go for another ride, i figured I'd check to see what it was, and sure enough it was the ground wire attached to their rectifier to the connector..


Oh and no; it was never hooked up to a charger..

[wilson889]

photos!  Sorry about quality.. not sure why my camera wouldnt focus in on the piece..

[scottly]

Disconnect the plug from the rectifier, and test for continuity from the yellow stator wires (the ones that go under the left-side engine cover) to frame ground. There should be NO continuity; you should get the same reading on your meter as when the meter probes are not touching each other.

[wilson889]

Disconnect the plug from the rectifier, and test for continuity from the yellow stator wires (the ones that go under the left-side engine cover) to frame ground. There should be NO continuity; you should get the same reading on your meter as when the meter probes are not touching each other.

sorry, what would this test be for?? a reason that the ground would fry? I figure that it didnt fully ground with the broken metal clip...

Oh and I am assuming I should test the wires on the bike, not this? with power on or off?

[scottly]

Power off, measure for continuity from the yellow wires to ground, on the bike harness, not the yellow wires on the rectifier.

[wilson889]

k I did the measurements, with bike off.. yellow to yellow theres nothing, just the beep. and ground to another ground, a beep as well. but when I did the yellow to the ground (in the plug and another ground) it didnt do anything, no beep and no measurements(same as when the meters are not touching.. . Is that a problem, or all normal now, and clearly supports my first assumption of their defective product..

[TwoTired]

Are you measuring the stator or the rectifier?  Your readings are fine for the stator.  Not enough for the rectifier.

Have you read the electric FAQ?  Or, would you rather someone held your hand?

[wilson889]

Are you measuring the stator or the rectifier?  Your readings are fine for the stator.  Not enough for the rectifier.

Have you read the electric FAQ?  Or, would you rather someone held your hand?

Wow... way to be a dick, man.. Yes, I have read the FAQ, I just want to be sure about everything. I have never worked on bikes before, or electronics for that matter.. Hence why, I am here on this site asking for help. oh and I forgot to do your measurements, forgot it was there..

[scottly]

Were there any melted wires on the original rectifier?

[TwoTired]

Hence why, I am here on this site asking for help. oh and I forgot to do your measurements, forgot it was there..

You ignore useful advice and then call me a dick?    Maybe someone else will "help" you.  Somehow, I've lost the urge, wilson889.

[wilson889]

Hence why, I am here on this site asking for help. oh and I forgot to do your measurements, forgot it was there..

You ignore useful advice and then call me a dick?    Maybe someone else will "help" you.  Somehow, I've lost the urge, wilson889.

I wasn't ignoring the useful advice. And I must have assumed a different tone in your last message, I apologize.

Scottly- Yes there was, but it was melted before I got the bike, so I do not know the cause. The wire that was melted was the ground as well, except that ground melted up into the wiring harness. I have re wired that ground since. With the new rect. only the ground on their unit was damaged and not my new wire..

[scottly]

If in both cases the damage is melted ground wires, I would guess that the new rectifier may have been good before the gremlin let the smoke out. I sure wouldn't risk damaging another one until I was sure everything was ok. When a wire melts inside a harness, in can melt through the insulation of a neighboring wire, causing shorts.

[bryanj]

Bad Main ground to engine

[scottly]

The PO didn't hook up the battery backwards, did he??

[wilson889]

If in both cases the damage is melted ground wires, I would guess that the new rectifier may have been good before the gremlin let the smoke out. I sure wouldn't risk damaging another one until I was sure everything was ok. When a wire melts inside a harness, in can melt through the insulation of a neighboring wire, causing shorts.

I did take apart the harness quite a way up to make sure other wires were not damaged.  and about the PO hooking up battery backwards, I haven't a clue..

To BryanJ- If it was a bad main ground to engine, wouldnt there be other problems? it seems to be contained/restricted in just this one area of bike(rectifier harness). I have no other problems thus far. everything electrical is in working order.

I am waiting for a member to get back to me about a rectifier he has to offer, so I wont be purchasing a brand new one, just a working one. I wont be wasting too much money.. Or if I can find a way, I might just fix this rectifier-wire and metal clip, maybe make another connection for that though--.  I will update when that time comes..

[bryanj]

Nope, 'cos the other ground to frame is up by the coils and the dtarter current has to use the small wire!