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Post by revver on Sept 25, 2014 18:23:21 GMT
steve please move in posted in wrong place.
the wife has a suzuki gs 125, the bike is trashing batteries, (2 showing 8v) what i have done so far,
charged another battery, using an optimate, showing 12.7 v
put it on bike and it just clicked
put it on charge again, only this time i put a voltmeter on it before i hit the starter, 12v but when i pressed the starter it went down to 2v.
bumped started and checked the voltage running, the reading was 13.9v and stayed the same when i revved the bike, turned lights on and it dropped to 13v.
i am useless with electrics and not sure where to look next other than starter motor. please help. thanks, kev.
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ian
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Isle of Man
Posts: 5,266 
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Post by ian on Sept 25, 2014 18:35:19 GMT
Sounds like the starter motor to me, Kev. Not familiar with that bike, but usually the 12v supply to the starter button & starter relay is fused, so a short here would blow the fuse. The big cable from the starter relay to the starter motor isn't fused, so will put a short on the battery. One possibility is the insulation round the stud on the motor breaking down allowing the stud to touch the motor case. Maybe a seized/jammed starter motor would have the same effect - not sure?
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Post by revver on Sept 25, 2014 18:49:46 GMT
thanks ian will have a look when tomorrow or when i get back from the meet.
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Post by scania on Sept 29, 2014 16:41:18 GMT
I have one of these, I passed my A1 licence on it many years ago, mine is unbreakable, I,m surprised anything can go wrong with them. I will interested to hear what the problem turns out to be.
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Post by mikef on Sept 29, 2014 17:30:19 GMT
Hi Revver.
Are you sure both batteries are good?
If you are unsure then a good test would be to see what voltage you get across the battery with the headlamp switched on without the engine running. A good battery should power the headlamp without a significant volt drop.
If the batteries are known to be good, then it suggests a fault with the starter motor or a short circuit in the wiring.
Good luck.
Mike.
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Post by scania on Sept 30, 2014 3:50:49 GMT
I had a problem like this in a van years ago, it turned out that a rat had chewed the wiring, got the wh**e in the end, finished him off with shovel and some help from a jack russel dog.
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Post by revver on Sept 30, 2014 21:18:43 GMT
I have one of these, I passed my A1 licence on it many years ago, mine is unbreakable, I,m surprised anything can go wrong with them. I will interested to hear what the problem turns out to be. so did i, it was my second bike and i wrote it off the evening i passed my test  secondhand frame and forks job done. the wife has binned it twice so far. good little bikes just a bit slow. |
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Post by revver on Sept 30, 2014 21:28:09 GMT
Hi Revver. Are you sure both batteries are good? If you are unsure then a good test would be to see what voltage you get across the battery with the headlamp switched on without the engine running. A good battery should power the headlamp without a significant volt drop. If the batteries are known to be good, then it suggests a fault with the starter motor or a short circuit in the wiring. Good luck. Mike. both batteries were brand new. going to do the light test tomorrow. took the starter and lead off tonight and wired it up in the shed using the starter wire and a different wire, i got the same read out. the battery went from 12v to 6v. the starter lead looks good no breaks in the sheath. |
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Post by scania on Sept 30, 2014 23:28:05 GMT
Did you check the water and electrolyte level in the batteries, even a new battery can be low in water or be a dud.
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Post by paddlesat16 on Oct 1, 2014 5:54:16 GMT
It could be a couple of things....
the starter solenoid could have failed or the starter motor bushes could be worn out. The solenoid can be tested(utube for how to vids) bushes are cheap and easily changed.
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Post by scania on Oct 7, 2014 23:46:36 GMT
How did you get on with this ?
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Post by revver on Oct 9, 2014 21:33:37 GMT
been waiting for new battery which arrived today, so i have filled it up and is on charge now. got a busy weekend ahead taking mum to hospital 50 miles away. may have to come back home and then go back to fetch her then scrumping on sunday to make more home brew. |
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Post by scania on Oct 9, 2014 22:40:56 GMT
Do you have one of those 'clamp' multimeters the ones that gave two 'crabs claws' they used to be expensive to buy but not so much now.
After you fit the new battery you could switch everything off, then clamp the jaws of the metre around the main battery lead and see is there any current flowing out of the battery, (there should be nothing flowing with the lights and ignition switched off)
If there is then, break some of the loome tie clips and sheathing and start measuring wires individually to localise the leak.
There is always the chance the other batteries were duds or maybe the generator was not charging, again you can use the clamp meter to measure current flow out of the generator once the engine is running.
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Post by revver on Oct 10, 2014 18:19:08 GMT
no just a bog standard one, i have bought a third battery now and filled it yesterday and its been on charge overnight so will unplug and leave for an hour and measure the voltage and again in the morning, make sure that is good before i start again, got to try and catch up on all the advice now on sunday. thanks, kev.
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Post by scania on Oct 10, 2014 20:43:15 GMT
Best of look, let us know the outcome.
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secondhand frame and forks job done. the wife has binned it twice so far. good little bikes just a bit slow.