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Damnut
Posted on Wednesday, March 08, 2017 - 10:50 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I had an issue riding home the other day where my dash kept shutting off and my electrical accessories where acting up.(blinkers/headlight not working right) When I shut if off, it wouldn't turn over or fire up.

So now I have it in my garage and I'm reading 10.8V at all of my ground points, even at the ground point on the frame behind the headlight. I have the dash disconnected and was reading voltages on pins 5 & 6. (P5/GND-P6/12V) I get 12.8V on pin 6 and 10.8V on pin 5 from each pin to the negative terminal on my battery. I connected the negative wire from a LED taillight that I have to the negative on the battery and stuck the positive side of the light into pin 5 on the dash. Well the taillight lit up.

If I unplug the KEY SW fuse the voltage drops to 1.3V
If I unplug the IGNITION relay the voltage drops to 9.6V.
If I unplug the KEY SWITCH relay the voltage drops to 9.6V.
If I unplug both of the relays above the voltage drops to 1.3V and if I plug any one off them into either socket I get 9.6V.
If I connect a wire to the negative side of the battery and ground out the chassis everything seems to work ok. When I do that I can hear the relays click.

So I'm not sure of it's an actual grounding problem or something else weird going on. Any advise would be most helpful as I don't want to fry anything by grounding out the chassis.
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Sparky
Posted on Thursday, March 09, 2017 - 10:29 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

"If I connect a wire to the negative side of the battery and ground out the chassis everything seems to work ok. When I do that I can hear the relays click."

That tells me that the battery negative post to the chassis ground is open. Try replacing the battery negative cable or, as a minimum, check continuity of the negative cable after disconnecting it at both ends - it should have zero resistance. If it checks out OK, then clean the place where the cable attaches to the chassis.
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Damnut
Posted on Saturday, March 11, 2017 - 01:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Yeah I've been overthinking it, it's definitely an open ground problem. I need to find out where the first chassis ground is on this bike, I think that's where the issue is. Ideally I'd like to find the problem instead of just adding my own battery to chassis ground. I don't really want to cut into my main harness but I'm going to have to in order to fix it.

The electronics on the front of the bike have a separate chassis ground behind the headlight and that part checks out ok.
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Crusty
Posted on Saturday, March 11, 2017 - 02:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Jim; before you cut into the harness, see if you can find the point where the negative cable connects to the frame. it might be something as easy as a loose bolt or maybe a bit of corrosion between the cable end and the frame. I just have a strong suspicion that it's going to be something simple and easy to remedy.
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Damnut
Posted on Saturday, March 11, 2017 - 04:47 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The problem is that I don't know where that chassis ground is.
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Coolice
Posted on Saturday, March 11, 2017 - 07:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Main ground is to the left of the fuel pump.

8mm or T-27 to tighten.
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Damnut
Posted on Saturday, March 11, 2017 - 09:13 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks Mike!
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Damnut
Posted on Sunday, March 12, 2017 - 10:22 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Well it seems as though someone forgot to put the bolt through the eye of the ring terminal of the main ground. This is the way I found it. The bolt was there, I just thought to take a picture after I removed it.

Before I bought the bike, the dealer replaced the fuel pump because something was wrong with it. It looks like the mechanic missed a crucial part of the reassembly. Oops.

Thanks Mike for saving me valuable time by letting me know where that ground point was! I asked on multiple platforms without an answer, BadWeb rocks.



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Crusty
Posted on Sunday, March 12, 2017 - 11:27 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I love it when my instincts get validated. I'm really glad that the cure is so easy and simple.
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