Wiring harness fried


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phoenixtubs
Posts: 46
Joined: Mon Jun 01, 2015 2:56 pm
Location: Chicago, IL
Motorcycle: 1985 Interstate
1987 VT700C Shadow
1978 GL 1000

Wiring harness fried

Post by phoenixtubs » Mon Jul 02, 2018 4:29 pm



Hi,
I was out riding today when all of a sudden the bike shut down and started smoking. I've ridden about 500 miles so far this year with no issues. Looks like I really fried the wiring harness, I was able to trailer it home and take pictures. I don't know why this happened or how, but here are some pics of what it looks like now - it's not pretty. Hoping to get some repair advice and maybe discover what caused this. After I got the bike back home I went to check the dog bone fuse, and I can't find it - wondering if PO pulled it and did not replace with anything? Thanks, looking forward to your response.

Front of bike under headlight


Close up


behind false tank, installed a relay a few weeks ago


Close up


female connector rectifier


male connector rectifier


No fuse?





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SnoBrdr
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Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

129K Original Owner

Re: Wiring harness fried

Post by SnoBrdr » Mon Jul 02, 2018 8:13 pm

phoenixtubs wrote:
Mon Jul 02, 2018 4:29 pm
Hi,
I was out riding today when all of a sudden the bike shut down and started smoking. I've ridden about 500 miles so far this year with no issues. Looks like I really fried the wiring harness, I was able to trailer it home and take pictures. I don't know why this happened or how, but here are some pics of what it looks like now - it's not pretty. Hoping to get some repair advice and maybe discover what caused this. After I got the bike back home I went to check the dog bone fuse, and I can't find it - wondering if PO pulled it and did not replace with anything? Thanks, looking forward to your response.

Front of bike under headlight
Front under headlight 1.jpg

Close up
close up 1.jpg

behind false tank, installed a relay a few weeks ago
relay - regulator 2.jpg

Close up
Close up 2.jpg

female connector rectifier
rectifier connector female.jpg

male connector rectifier
rectifier connector male.jpg

No fuse?
No fuse maybe.jpg
Fuse is supposed to be to the right of the battery in a little holder with 2 screws.

After so many years, the wire gets brittle, could have snapped or the PO could have hacked it all up.

Went to ground and poof.

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terryt
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Motorcycle: 1979 gl1000 trike
1989 gl1500 trike

Re: Wiring harness fried

Post by terryt » Tue Jul 03, 2018 2:38 am

What was the relay fitted for. it looks like the wires from that haven't burnt.

phoenixtubs
Posts: 46
Joined: Mon Jun 01, 2015 2:56 pm
Location: Chicago, IL
Motorcycle: 1985 Interstate
1987 VT700C Shadow
1978 GL 1000

Re: Wiring harness fried

Post by phoenixtubs » Tue Jul 03, 2018 6:07 am

The relay was installed so the regulator could read the voltage directly from the battery. Actually the wire coming from the harness, connected to the relay, and that relay wire are completely fried. The connector between those wires melted off.

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DenverWinger
Posts: 496
Joined: Thu Jun 23, 2011 2:20 pm
Location: Denver, CO
Motorcycle: 1980 GL-1100 STD Vetter (2005-)
1993 GL-1500 Aspencade (2017-)
1983 Trav-Lite Camper (2010-)
Past rides
1972 CL-350 (1980-1988) sold
1978 Suzuki GS-550 (1985-2005) sold
1977 GL-1000 (2002-2006) sold

Re: Wiring harness fried

Post by DenverWinger » Tue Jul 03, 2018 7:27 am

Wouldn't be surprised if it was a catastrophic rectifier failure. If one diode shorts out the bike would still run but the charging would be seriously compromised, and the remaining five diodes and the stator would be stressed. But if another diode shorts on the opposite rail (+ or -) then battery voltage has a direct path to ground thru the shorted diodes, and SHOULD blow the main fuse, or in your case, wiring harness. :?
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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WingAdmin
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Re: Wiring harness fried

Post by WingAdmin » Tue Jul 03, 2018 8:01 am

Yup, from that last picture, it appears as someone has cut out the main fuse and replaced it with just a piece of wire - so no main fuse. Then you had a dead short to ground somewhere, and this is the result. Sorry to see it!

phoenixtubs
Posts: 46
Joined: Mon Jun 01, 2015 2:56 pm
Location: Chicago, IL
Motorcycle: 1985 Interstate
1987 VT700C Shadow
1978 GL 1000

Re: Wiring harness fried

Post by phoenixtubs » Tue Jul 03, 2018 8:19 am

I've ordered a harness from ebay, it should get here next week. I'm a novice when it comes to electric but I think I can handle it. I've been reading and re-reading WingAdmin's Electric 101 posts as well (thanks for that).

Is there anything I should be doing now, before the new harness gets here?

Any tips on installing the new harness?

Are the diodes in the rectifier?

I found a bit of a rat's nest behind the headlight. Broken ground, some exposed wiring and corrosion on a connector:





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SnoBrdr
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Re: Wiring harness fried

Post by SnoBrdr » Tue Jul 03, 2018 11:05 am

phoenixtubs wrote:
Tue Jul 03, 2018 8:19 am
I've ordered a harness from ebay, it should get here next week. I'm a novice when it comes to electric but I think I can handle it. I've been reading and re-reading WingAdmin's Electric 101 posts as well (thanks for that).

Is there anything I should be doing now, before the new harness gets here?

Any tips on installing the new harness?

Are the diodes in the rectifier?

I found a bit of a rat's nest behind the headlight. Broken ground, some exposed wiring and corrosion on a connector:

Headlight rat's nest.jpg

Headlight connector corrosion.jpg
Did you get a NEW harness or another 40 year old one?

Inspect it very carefully for any breaks or cuts.

A lot of them have suffered injuries from the dreaded 70s era scotch locks.

Carefully check all the plugs of signs of corrosion as well.

phoenixtubs
Posts: 46
Joined: Mon Jun 01, 2015 2:56 pm
Location: Chicago, IL
Motorcycle: 1985 Interstate
1987 VT700C Shadow
1978 GL 1000

Re: Wiring harness fried

Post by phoenixtubs » Tue Jul 03, 2018 11:11 am

Thanks for the advice. I ordered a 40 year old harness because I couldn't find a new one. Are you aware of a source for a new one?

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SnoBrdr
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Re: Wiring harness fried

Post by SnoBrdr » Tue Jul 03, 2018 11:15 am

phoenixtubs wrote:
Tue Jul 03, 2018 11:11 am
Thanks for the advice. I ordered a 40 year old harness because I couldn't find a new one. Are you aware of a source for a new one?
No, that's why I ask.

I do know of people who have made their own.

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WingAdmin
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Re: Wiring harness fried

Post by WingAdmin » Tue Jul 03, 2018 6:52 pm

SnoBrdr wrote:
Tue Jul 03, 2018 11:15 am
phoenixtubs wrote:
Tue Jul 03, 2018 11:11 am
Thanks for the advice. I ordered a 40 year old harness because I couldn't find a new one. Are you aware of a source for a new one?
No, that's why I ask.

I do know of people who have made their own.
I'd be sorely tempted to take that 40 year harness apart, blueprint it, then build a jig from it so that I could build a new one, with brand new wire and connectors, and maybe some larger gauge wire while I was at it.

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SnoBrdr
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Re: Wiring harness fried

Post by SnoBrdr » Tue Jul 03, 2018 7:49 pm

WingAdmin wrote:
Tue Jul 03, 2018 6:52 pm
SnoBrdr wrote:
Tue Jul 03, 2018 11:15 am
phoenixtubs wrote:
Tue Jul 03, 2018 11:11 am
Thanks for the advice. I ordered a 40 year old harness because I couldn't find a new one. Are you aware of a source for a new one?
No, that's why I ask.

I do know of people who have made their own.
I'd be sorely tempted to take that 40 year harness apart, blueprint it, then build a jig from it so that I could build a new one, with brand new wire and connectors, and maybe some larger gauge wire while I was at it.
Not really that hard to do and wouldn't cost all that much.

phoenixtubs
Posts: 46
Joined: Mon Jun 01, 2015 2:56 pm
Location: Chicago, IL
Motorcycle: 1985 Interstate
1987 VT700C Shadow
1978 GL 1000

Re: Wiring harness fried

Post by phoenixtubs » Tue Jul 03, 2018 8:11 pm

I'm really thinking about doing that. At a minimum I'm going to pull the old wrapping off so I can make sure everything is in good shape. Are all those same wire colors easy to find?

I've determined my rectifier is shot, and I was reading about replacing it with a regulator/rectifier and eliminating the existing regulator. Has anyone done that and had a good result?

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SnoBrdr
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Re: Wiring harness fried

Post by SnoBrdr » Tue Jul 03, 2018 8:24 pm

phoenixtubs wrote:
Tue Jul 03, 2018 8:11 pm
I'm really thinking about doing that. At a minimum I'm going to pull the old wrapping off so I can make sure everything is in good shape. Are all those same wire colors easy to find?

I've determined my rectifier is shot, and I was reading about replacing it with a regulator/rectifier and eliminating the existing regulator. Has anyone done that and had a good result?
You really can't use the Honda colored wires as they are kinda odd.

You can use different colored wires as long as you document each wire for future reference,

phoenixtubs
Posts: 46
Joined: Mon Jun 01, 2015 2:56 pm
Location: Chicago, IL
Motorcycle: 1985 Interstate
1987 VT700C Shadow
1978 GL 1000

Re: Wiring harness fried

Post by phoenixtubs » Mon Jul 23, 2018 10:06 am

Just to follow up, I pulled the old wrapping off the new (used) harness, checked all connections, checked continuity, re-wrapped and installed it and it worked! I had to replace a couple of plug connectors, and a few bad wires in the sub harnesses that needed repair. I spent a lot of time reading the color schematic and ended up with a pretty good understanding of where the wires go and what they do. I also went with regulator/rectifier unit and eliminated the voltage regulator. So far seems to be charging as it should.

For someone who knew next to nothing about the electrical system I think the repair went well. It really wasn't that difficult once I began to understand the schematic. Thanks again for the advice.

Ed



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