Yamaha G1 quit, blows positive fuse even with switch off.

jimmejohn · 06-27-2015, 12:35 PM

I volunteer at a county fair and a fellow board member brought me a Yamaha G1. He said it just quit. I don't know where to start to troubleshoot this as it will blow a 20 amp fuse as soon as contact is made. Any thoughts would be greatly appreciated!

I have checked the wires for obvious shorts,grounding, or abrasion but can see nothing.

1989Marathon · 06-27-2015, 12:50 PM

Does it blow the fuse in forward and reverse?
BTW, that should be a 10amp fuse.

Sorry, I just re-read your title.
If it does it with the key off, and the pedal not pressed, I would suspect something is up with the R/W wire going to the footswitch.

jimmejohn · 06-29-2015, 04:36 PM

Thanks for the reply 1989 Marathon,
Sorry for delay, another member has dead Harley I was looking at.

I was wrong about the positive fuse I posted. When I looked at the r/w wire I found the fuse that blows is the -. It goes from CDI module to black wire that goes to lower left small terminal on outer solenoid. I assume this might mean a bad CDI?

jimmejohn · 06-29-2015, 04:38 PM

Just a thought, any chance you are near Hemlock? Sure would like to meet you!!ha

1989Marathon · 06-29-2015, 04:46 PM

I'm about 20 minutes from Hemlock.

1989Marathon · 06-29-2015, 05:08 PM

I would grab the schematic from the stickies above, and find all the devices that the black wire from the negative fuse is connected to. I would disconnect them all, replace the fuse and see if it blows. If it does, it is likely a harness issue. If it doesn't, connect one device at a time and see when the fuse blows.

jimmejohn · 06-29-2015, 06:03 PM

Thank you for the info. I will start in the mornong. If you get bored, I'm at the fairgrounds!! Ha

jimmejohn · 06-29-2015, 06:04 PM

Wow, can't spell either. Will start in the morning.

1989Marathon · 06-29-2015, 06:04 PM

What's going on at the fairgrounds? I was just there a couple weeks ago for the gun show.

jimmejohn · 06-29-2015, 06:13 PM

This week, we have a 4-h horse camp. About 38 young people learning how to ride in the various competitions. They will be here until Thursday.
I am here until after the fair, just getting ready with lawn,grounds, and of course, golf carts.

06-27-2015, 12:35 PM	#1
jimmejohn Not Yet Wild Join Date: Jun 2012 Location: Fl, and NY Posts: 13	Yamaha G1 quit, blows positive fuse even with switch off. I volunteer at a county fair and a fellow board member brought me a Yamaha G1. He said it just quit. I don't know where to start to troubleshoot this as it will blow a 20 amp fuse as soon as contact is made. Any thoughts would be greatly appreciated! I have checked the wires for obvious shorts,grounding, or abrasion but can see nothing.

06-27-2015, 12:50 PM	#2
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: Yamaha G1 quit, blows positive fuse even with switch off. Does it blow the fuse in forward and reverse? BTW, that should be a 10amp fuse. Sorry, I just re-read your title. If it does it with the key off, and the pedal not pressed, I would suspect something is up with the R/W wire going to the footswitch.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

06-29-2015, 04:36 PM	#3
jimmejohn Not Yet Wild Join Date: Jun 2012 Location: Fl, and NY Posts: 13	Re: Yamaha G1 quit, blows positive fuse even with switch off. Thanks for the reply 1989 Marathon, Sorry for delay, another member has dead Harley I was looking at. I was wrong about the positive fuse I posted. When I looked at the r/w wire I found the fuse that blows is the -. It goes from CDI module to black wire that goes to lower left small terminal on outer solenoid. I assume this might mean a bad CDI?

06-29-2015, 04:38 PM	#4
jimmejohn Not Yet Wild Join Date: Jun 2012 Location: Fl, and NY Posts: 13	Re: Yamaha G1 quit, blows positive fuse even with switch off. Just a thought, any chance you are near Hemlock? Sure would like to meet you!!ha

06-29-2015, 04:46 PM	#5
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: Yamaha G1 quit, blows positive fuse even with switch off. I'm about 20 minutes from Hemlock.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

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06-29-2015, 05:08 PM	#6
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730	Re: Yamaha G1 quit, blows positive fuse even with switch off. I would grab the schematic from the stickies above, and find all the devices that the black wire from the negative fuse is connected to. I would disconnect them all, replace the fuse and see if it blows. If it does, it is likely a harness issue. If it doesn't, connect one device at a time and see when the fuse blows.
1989Marathon Gone Wild Join Date: Oct 2010 Posts: 6,730

06-29-2015, 06:03 PM	#7
jimmejohn Not Yet Wild Join Date: Jun 2012 Location: Fl, and NY Posts: 13	Re: Yamaha G1 quit, blows positive fuse even with switch off. Thank you for the info. I will start in the mornong. If you get bored, I'm at the fairgrounds!! Ha

06-29-2015, 06:04 PM	#8
jimmejohn Not Yet Wild Join Date: Jun 2012 Location: Fl, and NY Posts: 13	Re: Yamaha G1 quit, blows positive fuse even with switch off. Wow, can't spell either. Will start in the morning.

06-29-2015, 06:13 PM	#10
jimmejohn Not Yet Wild Join Date: Jun 2012 Location: Fl, and NY Posts: 13	Re: Yamaha G1 quit, blows positive fuse even with switch off. This week, we have a 4-h horse camp. About 38 young people learning how to ride in the various competitions. They will be here until Thursday. I am here until after the fair, just getting ready with lawn,grounds, and of course, golf carts.

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