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1985 XV700 - electrical issues - where to begin

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1985 XV700 - electrical issues - where to begin

PostAuthor: mauricedonini » Wed Jun 12, 2019 9:48 am

Hi gang,

Recently picked up a huge pile of **** 1985 XV700. Could be the ultimate project bike.

Starting to go through the electrical system. With power pretty much nothing works. Battery is good. Ground is good. Went thru all the connectors in the headlight bucket to identify/document what connectors/pins have power.

Next steps - go through the switches on both handlebars. Also found some instructions in the service manual on testing the relays.

Here is what is working - taillight, oil pressure light and the turn signal indicator light.

There doesn't seem to be any electrical part missing or any broken wires.

Thinking at this point will need to address one component at a time. Possibly starting with the headlight.

Any questions/comments/feedback is appreciated.

Thank you
Thank you

Maurice
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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: bstig60 » Wed Jun 12, 2019 12:22 pm

Get a good service manual, Haynes is the best for what you are doing because it has colored wiring diagrams. Makes life a lot easier. Take one component at a time starting with the main fuse and working out. After the main fuse comes the ignition switch, make sure you have power there, if not, that will affect a lot of things including the headlight.
Bill
"It´s a friggen motorcycle, it´s not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you s**t your pants every now and then. "

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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: Cusstout 1100 » Wed Jun 12, 2019 8:58 pm

There is a small ground wire, about 16 guage on the left side behind the pod and up under the tank. It's grounded to the frame/airbox at that point and serves to ground everything in that bowl of spaghetti you found inside the headlight. Might be worth checking to see that it has a nice shiny spot to ground to.
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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: mauricedonini » Thu Jun 13, 2019 7:45 am

Hi
Cusstout 1100

1. Chopped Virago - very cool!
2. The 16 gauge ground. Where does the wire connect in the spaghetti bucket?

Thank you,
Thank you

Maurice
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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: Cusstout 1100 » Thu Jun 13, 2019 10:28 am

Thanks for the comment on the bike.

That ground wire has multiple connections in the headlight bucket. Essentially, everything on the front of the bike except the front brake light switch, clutch switch, and kill switch end up grounding through that wire. There are some single connections, some two into 1, etc. In other words, every black wire you find in the bucket connects to that ground wire.
My Ride, '97 XV1100, +14, 10" over forks, progressive rear, Jardine forward controls, cobra slip-ons, K&N Filter, Dyno Jet Stage 1, Kuryakin grips, heat demon heaters, custom fabricated seat, chrome side covers, bullet signals, risers, custom modified rear fender with modified FZ1 tail light, sectioned and reversed front fender, custom paint...

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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: mauricedonini » Sun Jun 16, 2019 6:47 pm

Hi,

Found the ground wire connected to the frame. Wasn't bad, but cleaned it up anyway. No joy.

Took off the instrument cluster. Looks like the insects have owned this for a while. Will open it up and check all the connections.

There's a three prong wire into the Ignition switch. Red, blue and brown. Red is power in. Thinking when the switch is in the 'on' position, power should be flowing out of blue or brown (or both). Not happening. Looks like a working ignition switch is needed.

Did find one unusual connection in the headlight bucket. Pink wire, from the left handlebar switch, was connected to a double black wire. Didn't see any other pink wires.

Thanks for the help.
Thank you

Maurice
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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: Jake » Sun Jun 16, 2019 8:04 pm

mauricedonini wrote:Pink wire, from the left handlebar switch, was connected to a double black wire. Didn't see any other pink wires.



Pink wire to black is the horn.

Here’s a link to the wiring diagram.

http://www.viragotech.com/wiring/86_96_ ... _XV750.jpg
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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: mauricedonini » Mon Jun 17, 2019 9:57 am

mauricedonini wrote:
There's a three prong wire into the Ignition switch. Red, blue and brown. Red is power in. Thinking when the switch is in the 'on' position, power should be flowing out of blue or brown (or both). Not happening. Looks like a working ignition switch is needed.



Looking at the wiring diagram, looks like when the key is in the 'On' position, power should flow from red to blue and brown.

At this point I assume the ignition (main switch on the diagram) is bad.

What's the harm is jumping directly from red to blue and red to brown?

Thank you
Thank you

Maurice
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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: Jake » Mon Jun 17, 2019 10:17 am

mauricedonini wrote:
Looking at the wiring diagram, looks like when the key is in the 'On' position, power should flow from red to blue and brown.

At this point I assume the ignition (main switch on the diagram) is bad.

What's the harm is jumping directly from red to blue and red to brown?

Thank you


No harm. The blue wire goes to the tail light and running lights. The brown is your main power.
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It’s what you know for sure that just ain’t so.”

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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: mauricedonini » Tue Jun 25, 2019 9:01 am

Hi,

Made some progress. Installed a new ignition switch and a different right hand control switch. Cleaned up the ground connections.

Now have lights, power to the broken turn signals & horn.

Looks like the tach will work. Not so sure about the speedometer.

Tried to start it last night - no luck. Realized later that the kickstand is down. Believe there's a switch that prevents the bike from turning over if the kickstand is down.

More testing/fiddling to come.
Thank you

Maurice
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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: Flyingdog » Tue Jun 25, 2019 10:04 am

mauricedonini wrote:Realized later that the kickstand is down. Believe there's a switch that prevents the bike from turning over if the kickstand is down.


If this "is" your only non-start issue, #34 is the culprit. Usually just a stuck plunge. Just pull the boot back and shoot some lube in and work the plunger. I assume you do know it will turn over with side stand down, but only in neutral.

https://www.yamahapartshouse.com/oempar ... ectrical-1
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Re: 1985 XV700 - electrical issues - where to begin

PostAuthor: mauricedonini » Tue Jun 25, 2019 2:35 pm

Flyingdog wrote:
mauricedonini wrote:Realized later that the kickstand is down. Believe there's a switch that prevents the bike from turning over if the kickstand is down.


If this "is" your only non-start issue, #34 is the culprit. Usually just a stuck plunge. Just pull the boot back and shoot some lube in and work the plunger. I assume you do know it will turn over with side stand down, but only in neutral.

https://www.yamahapartshouse.com/oempar ... ectrical-1



Another good piece of advice. Thanks.
Thank you

Maurice
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