Electrical Question

jvizzacc

jvizzacc

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Let's say that I wanted to apply 12v to the brake light while the sled was off, kinda like a parking light using a battery or 12v source. I could simply apply the 12v after the brake switch and it should light, right? Would there be any problems? Should I disconnect something first so as not to backfeed the CDI and magneto? Will the brake switch in the OFF position do this for me?

Thanks

:2strokes:
 

When we stop out on a lake and did not want to be run into, we park the electric start sled in back. When a sled was comming we simply turned the key on and hit the brake lever. The tail light will work without starting the sled with the key in the on position. Is this what you were looking for ?
 
Umm.. No. I'm not looking for a parking light. That was just an example. I was wondering what will happen to the rest of the electrical system if I backfeed 12v into it from another source.

Thanks
 
Well, by applying my own knowledge of electrical "theory", I don't see why it would hurt anything. Your not really back feeding anything, your introducing 12v to a wire. It will light the lamp, and any excess voltage should simply bleed off through the grounding system. Just as long as you don't exceed 12v. As long as your past the brake switch it will travel the path of least resistance, which will be down the wire to the brake lamp. When the sled is running it produces 12v, the same as what your going to introduce. Things melt when they have to much load/current, ie, going to ground, too much voltage, etc. As long as the wire isn't grounding out, the only load that should be generated is the lamp itself. This is all assuming that all your grounds are good.
 
Found an answer ... introduce a diode. This will allow electricity to flow in only one direction. Thanks.
 
A diode is what I would do to prevent any backfeed. Just remember, you have to put the diode in the right direction as there is two sides. Cathode (stripe side) and anode (non-stripe side) You would want to have the brake light and battery source on the Cathode(stripe side) of the diode to prevent your battery voltage from going back into the sled. And make sure to use at least a 7amp diode to be on the safe side. Good luck!

--Steve (O.C.)
 
Thanks for all the input. Cos, did I hear you right? A battery-powered machine runs lights/gauges/etc on DC current whereas a sled without a battery and starter is AC? That doesn't seem right. I am assuming that, since, every device has a dedicated and traceable ground that the electricial system (excluding ignition) is DC. An AC system wouldn't have a specific ground because half the wave would be lost to ground. Did I fail Elecronics 101? Someone please clarify this issue.
 
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well think of it this way... some Yamaha (ie my dads 94 vmax 600) sleds dont have electric start but the option is there. His sled never came with it but all the wires are there.
 
On any of the yamaha's with one headlight everything is ac. There is a charging coil that puts out 12vdc to charge the battery ( I think it 5w). It does not matter if its electric start or not its all ac. J



jvizzacc said:
Thanks for all the input. Cos, did I hear you right? A battery-powered machine runs lights/gauges/etc on DC current whereas a sled without a battery and starter is AC? That doesn't seem right. I am assuming that, since, every device has a dedicated and traceable ground that the electricial system (excluding ignition) is DC. An AC system wouldn't have a specific ground because half the wave would be lost to ground. Did I fail Elecronics 101? Someone please clarify this issue.
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O.K. the last machined I probed around on was built in the late 90's and the voltage at the lights was 12 VAC. It did not have a battery nor electric start. The was a 98 bearcat. The same was true on a 94 Polaris XLT & a 95 Tundra. I buddy had tried to wire in his GPS unit to his lighting harness and smoked the GPS!

I don‘t know what year, make or model your working with. Perhaps it has a full wave bridge rectifier on it to convert the AC produced by your coil to DC. It would also need a regulator on the circuit you want to tap into.

Try connecting a volt meter to your headlight after you fire the machine up. As you know, place the negative lead to the chassis. Experiment between the AC & DC mode and see what you get.
 
I was agreeing with you COS.. Even if you put a full bridge recitifier it probably be around 17vdc out because the AC current is regulated at 12vac rms.
Been there done that.. Smoked a HID ballast. I've been through the 98 vintage yamaha wiring in pretty good detail to get the HID to work. I think.. Its take 3 this winter.
 
Sleds with or without a battery run 12v DC to the accessories (lights, gauges, starter (if equipped)etc..). The only thing that runs AC is the ignition system (plugs, coils, and tach....). You should be able to get a 12vDC source under the handlebar pad (blue w/red or blue w/some color tracer, forget which) or you can take the seat off and get it in the 4 pin plug going to the tail light, again blue w/red or solid blue (I believe). Test the wires with a multi meter to verify. But it is definately DC. Putting an additionnal inline fuse to whateve you hook up to isnt a bad idea either

--Steve (O.C.)
 
Depends on the year!! Single headlights definetly have A/C.


NY AttakGT said:
Sleds with or without a battery run 12v DC to the accessories (lights, gauges, starter (if equipped)etc..). The only thing that runs AC is the ignition system (plugs, coils, and tach....). You should be able to get a 12vDC source under the handlebar pad (blue w/red or blue w/some color tracer, forget which) or you can take the seat off and get it in the 4 pin plug going to the tail light, again blue w/red or solid blue (I believe). Test the wires with a multi meter to verify. But it is definately DC. Putting an additionnal inline fuse to whateve you hook up to isnt a bad idea either

--Steve (O.C.)
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You may be right on the srx.

I can not say for sure on the srx. I assumed it was the same as the single headlight sx-s. I can tell you with certainity that the power circuit out side of the cdi and charging circuit on an single head light sx is ac. BTW there is one regulator and one regulator rectifier. http://216.37.204.206/wps/Yamaha_OEM/YamahaSnow.asp?Type=13&A=204&B=41


We can post the elctrical diagrams and hassle over them all day. Long I've got plenty of experience in the wiring a 98 700sx becuase of all my HID expermenting.
 
Ah, Ya they probably need the extra regulator/rectifier for the DC servo motor on the exhaust valves. I think the fuel gauage, and hand warmers may use dc also. But I have to refresh my memory.

I'd still like to see the volt meter on the headlight or the wiring diagram.
 
I fully understand what they are. What is 2 called in diagram? Not only that I have never in my life seen a regulator/recitifer with only 2 wire input.

BTW the blue wire comes out of the stator into the regulator and then to the headlights.

3 (regulator/rectifier) has two wires from the stator because it needs both legs of the ac circuit. Follow how many things are powered off 3. The fuel gauge, battery, and cdi.

Like my wife figured out after 5 years of knowing me. Arguing with an engineer is like mud wrestling a pig. The more you do it the more they like it.

mrviper700 said:
:o| the wires come out of the stator and go directly to the regulator/rectifier, then feed that dc to the dimmer switch, you understand a rectifier changes ac current to dc current??
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Steve, thank you for the answer to my question!

NY AttakGT said:
Sleds with or without a battery run 12v DC to the accessories (lights, gauges, starter (if equipped)etc..). The only thing that runs AC is the ignition system (plugs, coils, and tach....). You should be able to get a 12vDC source under the handlebar pad (blue w/red or blue w/some color tracer, forget which) or you can take the seat off and get it in the 4 pin plug going to the tail light, again blue w/red or solid blue (I believe). Test the wires with a multi meter to verify. But it is definately DC. Putting an additionnal inline fuse to whateve you hook up to isnt a bad idea either

--Steve (O.C.)
Click to expand...
 
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