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Electrical question

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Electrical question

Postby vwbuggyman » December 19th, 2004, 8:09 am

The heated grips on my 96 formulaS have stopped working. They are aftermarket grips, and according to the person I bought it from, they were new and worked fine last season. I started the motor, and tested all the terminals on the switch(3) with a voltmeter, and there was no power at any of them. My questions are:
1: Do pull-start, magneto engines have a ground?
2: If so, where would be a good place to connect a tester to it?
3: Where is a likely place for the power to be coming from? I have heard that the taillight power is a common source, but where would this wire be? I tried to trace the wire, but it is an absolute mess, with about a dozen different wire colors.

Thanks for the help. As you can probably tell, I do not know much about sled motors.
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Electrical question

Postby mnsnowboy » December 19th, 2004, 8:19 am

Buggyman-

[quote]1: Do pull-start, magneto engines have a ground?
2: If so, where would be a good place to connect a tester to it?
3: Where is a likely place for the power to be coming from? I have heard that the taillight power is a common source, but where would this wire be? I tried to trace the wire, but it is an absolute mess, with about a dozen different wire colors.[/quote]

1. Yes, all motors with a magneto must have a ground to complete an electrical circuit. Even though this motor generates AC current, the voltage must be rectified to operate lights and accessories.

2. Are you asking where to place your meter probe to a ground? I am not sure I understand your question. Anywhere you can get a good clean metallic surface is a good place to attach your ground lead for testing.

3. Any electrical power wire I'm sure would be suspect by someone hooking up external accessories. If I were you, I would also look at the line power to the igntion switch. A lot of times this is tapped for more voltage. I am guessing that your warmers will have some kind of regulator or control that conditions the current for them, check the wire that feeds that. A sled is a small enough machine where just about everything can be found by tracing it. Ask again for more questions!

-sb
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Electrical question

Postby craze1cars » December 19th, 2004, 8:38 am

Follow the wires from the handlebar heater switch backwards. Some will go up the handlebars, others will go to power source and ground. The latter are likely where your problem is. Since they were an aftermarket add-on, you should be able to easily identify where those wires were spliced into others to get power and ground. Frequently the ground is just a screw or bolt driven into the chassis.

You can ground on any clean metal on the chassis for your testing purposes.

If you'd like to throw a little money at making this headache go away, you can also buy brand new heated handlebar grip kits for about $30 and just replace the whole works. They'll come with detailed instructions on how to install them and it's easy to do.
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Electrical question

Postby vwbuggyman » December 19th, 2004, 8:51 am

Tracing the wires is easier said than done on this sled. Huge bundles of multiple connectors and wire color changes don't help things.

One wire from the switch(only one I could trace) goes down to a white bar(about 3 inches long) mounted(glued) where the battery would be on an electric start. Another connector comes out the other end of the bar, but it goes back under the motor. The taillight and headlight all work perfectly, so this is a bit of a mystery.

And magneto motors run on AC? That's news to me.

Where is the magneto, or is it built into the block?
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Electrical question

Postby vwbuggyman » December 19th, 2004, 11:57 am

anyone?

And where do the wires come out of the motor from the magneto?
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Electrical question

Postby jpiler » December 20th, 2004, 4:07 am

My guess is the after markets are wired wrong.Ski-doo wiring is different from the other manufacturers.You need to read the fine print when installing.*Special instruction for Ski-Doo installation!
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Electrical question

Postby mnsnowboy » December 21st, 2004, 1:51 pm

Well, you tell me how to get a rotor/stator to generate DC and you will be a rich man.

-sb
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Electrical question

Postby sledwrench » December 21st, 2004, 2:31 pm

Magneto motor? what is that. Motors with magnetos run on gasoline. The white bar may be a rectifier, and if the lights work, ITS working. The wires from the warmers should go to the switch. Start at the switch, and with the VOM set on AC voltage, check again with the engine running. Try with the switch in different positions. Check around for a fuse in the wiring.

The only way to produce DC current without rectifying is with a commutator ring and brushes (generator). Magneto's, stators, are all AC generating devices
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Electrical question

Postby jpiler » December 22nd, 2004, 6:47 am

That white bar is the resistor for your after market hand warmers!!
Those wires are to your hand warmers.

[url=http://www.hotgrips.com/trouble.html]http://www.hotgrips.com/trouble.html[/url]
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Electrical question

Postby mnsnowboy » December 22nd, 2004, 2:30 pm

Well SW, LOL, I didn't wanna get into it that deep, but OK! All that school's gotta be good fer sumthin! ;)

-sb
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