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Mystery battery wire? (SOLVED)

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Mystery battery wire? (SOLVED)

PostAuthor: Crom » Mon Mar 12, 2018 8:19 pm

mysterious wire.jpg


Howdy, first post here.

I pulled the battery on my 1996 Yamaha XV750 to charge after sitting for the winter. Didn't really give it long enough to fully charge before I put it back in and tried to start the bike. Bike turned over but battery was still to weak to do much cranking and I didn't get it started. I pulled the battery a second time to fully charge, and when I reinstall it I found a disconnected mystery wire that I must have yanked loose by accident.

Everything turns on, lights, signals and neutral light, but bike won't turn over. It's like the run switch is in the off position even though it's not. OIL and FUEL lights come on when I hit the starter. I made sure the bike is in neutral and tried to start it with the kickstand up and down. No luck.

Attached is a photo of the empty battery compartment with both POS and NEG cables and arrows are pointing to the disconnected mystery wire. Anyone know what it is and what I screwed up?

Thanks a ton for any help.
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Last edited by Crom on Tue Mar 13, 2018 9:21 pm, edited 1 time in total.

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Re: Mystery battery wire?

PostAuthor: XV535 » Mon Mar 12, 2018 8:42 pm

It is a thick red wire which suggests that it goes to the starter motor solenoid. (Probably direct from the battery. Do I see a spare loose earth wire as well ?

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Re: Mystery battery wire?

PostAuthor: Jake » Mon Mar 12, 2018 9:00 pm

I'll check mine tomorrow.
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Re: Mystery battery wire?

PostAuthor: Jake » Mon Mar 12, 2018 9:05 pm

XV535 wrote:It is a thick red wire which suggests that it goes to the starter motor solenoid. (Probably direct from the battery. Do I see a spare loose earth wire as well ?


Look where the arrows are pointing. Not the red wire.
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Re: Mystery battery wire?

PostAuthor: Crom » Tue Mar 13, 2018 3:27 am

XV535 wrote:It is a thick red wire which suggests that it goes to the starter motor solenoid. (Probably direct from the battery. Do I see a spare loose earth wire as well ?

The thick red wire is the battery positive. It's the thinner black wire that the red arrows are pointing at that I am concerned with. After I reinstall the battery it is the only wire not connected to anything. Is that what you mean by loose earth wire? Where would that connect to?

Thanks for the help.

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Re: Mystery battery wire?

PostAuthor: Jake » Tue Mar 13, 2018 4:46 am

As I said, I'll check mine later.
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Re: Mystery battery wire?

PostAuthor: Jake » Tue Mar 13, 2018 5:18 am

On second thought, I'll let XV535 answer your question. Apparently the fact I said I'd check mine ( '96 XV750 ) was not worthy of responding to.
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Re: Mystery battery wire?

PostAuthor: Crom » Tue Mar 13, 2018 5:27 am

Jake wrote:On second thought, I'll let XV535 answer your question. Apparently the fact I said I'd check mine ( '96 XV750 ) was not worthy of responding to.

Sorry if I offended you somehow, I wasn't trying to be rude in any way. If you are no longer willing to help me because you fell I was somehow rude by not replying fast enough then that's your call. No offense was intended.

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Re: Mystery battery wire?

PostAuthor: Flyingdog » Tue Mar 13, 2018 6:32 am

You know, by the looks of that formed bend of the wire in question, it almost looks to be from infront of the battery box. Ya might have to take that seat off. Just move it (wire) around and see where it stretchs to, I guess. Can't be tooo damn far away from something. Maybe something like it came of your rear break stop switch. Or..somethin' under the seat. Just spit-ball'n here :bg:
Last edited by Flyingdog on Wed Mar 14, 2018 5:47 am, edited 1 time in total.
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Re: Mystery battery wire?

PostAuthor: drainplug » Tue Mar 13, 2018 9:34 am

I don't think you offended him, it's a language thing. In the good ole USA we say "Ground" where as in Mother England they say "Earth".
Remember, they have the steering wheels on the "wrong" side of the car, or is it the right side?
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Re: Mystery battery wire?

PostAuthor: Flyingdog » Tue Mar 13, 2018 9:53 am

drainplug wrote:I don't think you offended him, it's a language thing. In the good ole USA we say "Ground" where as in Mother England they say "Earth".
Remember, they have the steering wheels on the "wrong" side of the car, or is it the right side?



Sorry bout the hijack...but I'd like to know how the hell you "earth" a vehicle anyhow. Last time I looked, they all had rubber tires.
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Re: Mystery battery wire?

PostAuthor: Aussiexv1100 » Tue Mar 13, 2018 1:25 pm

drainplug wrote:I don't think you offended him, it's a language thing. In the good ole USA we say "Ground" where as in Mother England they say "Earth".
Remember, they have the steering wheels on the "wrong" side of the car, or is it the right side?

I can vouch that it is the right side, the same as in Australia. Right is right.
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Re: Mystery battery wire?

PostAuthor: Cusstout 1100 » Tue Mar 13, 2018 3:54 pm

Oil level sensor wire? Looks like it might be going down under the crankcase...just a thought. And if memory serves correct, it connects in that jumble of wires above and just ahead of the battery box.
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Re: Mystery battery wire?

PostAuthor: mark75 » Tue Mar 13, 2018 4:27 pm

starter switch ----> viewtopic.php?f=140&t=35947
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Re: Mystery battery wire?

PostAuthor: Crom » Tue Mar 13, 2018 9:07 pm

Found it! Took off the seat and there was an empty bullet socket that the wire fit into perfectly. I must have yanked on and disconnected it when I took the battery out for charging. Bike started right up. I should have taken a photo before I put the seat back on, but I forgot. It was 49F here today so I took it for a short ride. Next up is springtime maintenance.

Many thanks to everyone who replied to my cry in the wilderness for help.

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Re: Mystery battery wire? [SOLVED]

PostAuthor: Flyingdog » Wed Mar 14, 2018 3:34 am

Crom..Good you found it. Something else I found useful on these models that have the battery slid into box sideways. Splice in a length of insulated wire, from the positive. So, that it reaches to the outside of the battery box. Wire on my bike just lays along the positive cable, in that molded battery box groove. And... hangs out, under the side cover. Just twist on a wire nut on the bare end. This way you have access to both, positive & negative, without always having to pull the battery out. Comes in quite handy for anything, like charging. The reason I did it, was to run my electric air pump, for the air mattress, when on camping trips. Sure beats laying on lumpy, cold ground. You Colorado people know what I'm talk'n about. Yep, it "WILL" snow in Leadville, in "July".

Ah..heck, guess I could have saved a few words and just snap a pic...
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Re: Mystery battery wire?

PostAuthor: Flyingdog » Wed Mar 14, 2018 5:19 am

Aussiexv1100 wrote:I can vouch that it is the right side, the same as in Australia. Right is right.


Yea...but....on this side of the pond..left is right & right is wrong. :cl: On sooo many levels. :bg:
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Re: Mystery battery wire? [SOLVED]

PostAuthor: Crom » Wed Mar 14, 2018 7:21 am

Flyingdog wrote:Crom..Good you found it. Something else I found useful on these models that have the battery slid into box sideways. Splice in a length of insulated wire, from the positive. So, that it reaches to the outside of the battery box. Wire on my bike just lays along the positive cable, in that molded battery box groove. And... hangs out, under the side cover. Just twist on a wire nut on the bare end. This way you have access to both, positive & negative, without always having to pull the battery out. Comes in quite handy for anything, like charging. The reason I did it, was to run my electric air pump, for the air mattress, when on camping trips. Sure beats laying on lumpy, cold ground. You Colorado people know what I'm talk'n about. Yep, it "WILL" snow in Leadville, in "July".

Ah..heck, guess I could have saved a few words and just snap a pic...

That's a sweet setup you've got. I've been thinking about motorcycle camping and my old back doesn't like the hard ground as much as it used to. Or maybe it never did...

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Re: Mystery battery wire? [SOLVED]

PostAuthor: 1stone0f8 » Wed Mar 14, 2018 11:22 pm

..left is right & right is wrong. :cl: On sooo many levels. :bg:


"...On so many levels!" :bg:

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Re: Mystery battery wire?

PostAuthor: drainplug » Thu Mar 15, 2018 8:54 pm

Aussiexv1100 wrote:
drainplug wrote:I don't think you offended him, it's a language thing. In the good ole USA we say "Ground" where as in Mother England they say "Earth".
Remember, they have the steering wheels on the "wrong" side of the car, or is it the right side?

I can vouch that it is the right side, the same as in Australia. Right is right.


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