i don't get it..wiring - HCS Snowmobile Forums

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Old 09-09-2019, 04:49 PM   #1 (permalink)
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Default i don't get it..wiring

i am trying to install a water temp gauge into a 1997 polaris xlt touring. the gauge i got is more automotive than snowmobile ( i guess) the polaris wiring harness tells me i can get 12v power in the dash with a yellow (power) and brown (ground) then a wire to sending unit. the gauge has 4 wires in it, black (ground), green ( sending unit), red (power) and yellow (light)..simple enough. it doesn't work, barely lights up the gauge needle but face is dark, led so i can match dash lights, but if i take it to a battery that i'm charging for the other sled, red and yellow hooked to pos battery and black to negative it all works.. what's up with that?? I even went as far as to hook up sending unit and hit it with a match and gauge moves... battery says 14.2v and harness in dash says 12.5 to 13v. what am I missing?????
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Old 09-09-2019, 05:54 PM   #2 (permalink)
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update: battery has 12.58dc volts, lights only have 1.2dc volts, if i change to ac volts it matches the battery so that says charging (rectifier)/ running (voltage regulator)system is ok, right? so i hooked up gauge to battery in sled and it all lights up, so why when i hook it up to dash harness it doesn't?? HELP!!!!!
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Old 09-09-2019, 07:46 PM   #3 (permalink)
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i've been busy looking up online for anything as to why my temp gauge only works from battery. i have read alot and some states that to get the gauge work you need straight DC volts, so with electric start i need a different rectifier with an extra red wire to run the gauge. but which one do i need to get for 1997 xlt touring....HELP!!
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Old 09-09-2019, 10:07 PM   #4 (permalink)
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Any used snowmobile rectifier will work. I just grab one from the used sled scrap yard here. As an aside, it is a good idea to add a capacitor as well to smooth the voltage.
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Old 09-10-2019, 06:26 AM   #5 (permalink)
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all older Polaris sleds everything runs on ac voltage. so all yellow wires are ac. the stator puts out ac voltage. the only thing needing dc is the battery.

a xlt touring has electric start right? so the regulator/rectifier will have two or three wires coming from it. yellow (ac) regulated voltage. red (dc) regulated voltage. and if brown that's ground. any red or red/white wire is 12vdc. pick it up there. if this was a auto gauge then yes all autos run on dc voltage. so that's why it doesn't work on the sleds yellow wires.
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Old 09-10-2019, 07:40 AM   #6 (permalink)
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Be careful using any red wire feeding the battery charging system. It can discharge the battery when engine isn't running. Might need to install a switch to shut gauge off.
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Old 09-10-2019, 01:00 PM   #7 (permalink)
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update: ran red wire from battery + side up to a switch on dash and had to put it all( power and lights) on DC to get it to work....yeah!!!
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Old 09-10-2019, 04:18 PM   #8 (permalink)
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Quote:
Originally Posted by oldguy56 View Post
update: ran red wire from battery + side up to a switch on dash and had to put it all( power and lights) on DC to get it to work....yeah!!!
You put your lights on a switch and on DC?

If so, it forces all current through the Voltage regulator/rectifier I believe. Normally, only the excess unused AC current goes through it plus a little for battery charging. This might exceed the rectifier's capacity.
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Old 09-10-2019, 04:40 PM   #9 (permalink)
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Age: 63
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not all the lights, just the one in the gauge, that was all dc volts to work, the sleds lights are still on ac volts..turns out nobody knew that the lights, which are LEDs and color changing, run on the dc, like the power to the gauge.
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Old 09-11-2019, 06:32 AM   #10 (permalink)
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Quote:
Originally Posted by oldguy56 View Post
not all the lights, just the one in the gauge, that was all dc volts to work, the sleds lights are still on ac volts..turns out nobody knew that the lights, which are LEDs and color changing, run on the dc, like the power to the gauge.
This makes more sense.
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