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Makotosun

Expensive battery strap

  • Tom P
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Expensive battery strap was created by Tom P

I was going to order one of the official rubber battery straps for my CT-1, then I thought why waste $15, which could fill up the gas tank, and cut a strip from my old front tire tube. 
JFYI


 
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26 Jun 2022 12:26 #1

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Replied by RT325 on topic Expensive battery strap

Good trick. Clutch rubber rings come in handy too. Hope you have a fuse somewhere further down the line in the red.
26 Jun 2022 20:49 #2

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Replied by msavitt on topic Expensive battery strap

do you have a fuse inline with that red lead?

I used an o-ring on one of my bikes to hold the two halves of the yamaha fuse holder together after losing the metal clip.
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27 Jun 2022 08:55 #3

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Replied by Tom P on topic Expensive battery strap

To be honest, I wasn't sure if this bike had a fuse. I just did some investigating, and it was tucked away in a plastic sleeve with a bundle of connections, near the rear fender. I opened it up and looked at it, and the fuse is in good shape, but there is no spare.

However, while I had the oil tank hanging down, I decided to pull the rectifier and test it, and it looks like it's shot. With an ohm meter hooked up correctly, I get no reading, if I reverse it I get 62k ohms. Is there an alternative diode I can use, or do I need to get another rectifier? The odd thing is, the bike is running fine, and the headlight is working.

   
27 Jun 2022 09:27 #4

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Replied by Gr8uncleal on topic Expensive battery strap

Is the battery charging?

New generic rectifiers are very inexpensive. 

 
27 Jun 2022 09:42 #5

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Replied by MarkT on topic Expensive battery strap

Rectifier (diode) is for battery charging circuit, not headlight.  

Yours looks fine to me.  No current flow allowed from red to white with + on red but current flow allowed from white to red with + on white.  Resistance reading of 63k ohms is kind of meaningless...  there is a connection in that current direction which is what is important.  

That fancy meter looks to have a diode test mode...  you could try that too.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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Last edit: 27 Jun 2022 09:47 by MarkT.
27 Jun 2022 09:46 #6

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Replied by MarkT on topic Expensive battery strap

If you still think it's bad, there's another simple test using battery and voltmeter (or test light) i can describe to you.  
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
27 Jun 2022 09:49 #7

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Replied by Tom P on topic Expensive battery strap

MarkT, I was going by what it says in the shop manual. It says I should be getting 9 to 10 ohms when the leads are connected correctly, and no reading when they are connected the opposite way.

 I just checked it in diode mode with my meter, and I get no reading when they are connected correctly, and .557 volts when they are connected the opposite way so I guess it is good, and the battery HAS been charging.

   
27 Jun 2022 10:11 #8

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Replied by msavitt on topic Expensive battery strap

glad you have a fuse!
I think your rectifier is probably ok because it doesn't flow in one direction and has high resistance in the other and I think the reading your getting is close to how mine measured too if I can remember which is always a question 
I would measure the voltage across battery with it running....it should be >6 volts at idle and a volt or two more when revved
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Last edit: 27 Jun 2022 11:38 by msavitt.
27 Jun 2022 11:37 #9

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Replied by Tom P on topic Expensive battery strap

The thing that was confusing me is that I'm getting the readings that I should be getting with the meter probes the other way, according to videos I've seen, but maybe it doesn't make a difference? In any case, the battery has been charging, so everything seems to be working. I'm also confused by the instructions on how to test it in the shop manual, those don't seem right.

By the way, I just put a meter on it and with the engine idling it's 6 volts, and goes up to 6.5 when I rev it. I think it's fine.
Last edit: 27 Jun 2022 13:35 by Tom P.
27 Jun 2022 12:56 #10

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