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Old 06-09-2015, 10:35 AM   #1
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Mystery Switch

There's a red translucent plastic rocker switch on the driver's side panel. It's below the vent, next to where my left knee is when I'm sitting in the driver's seat.

I can't find any reference to this switch in my owner's manual. Can anyone tell me what it operates?
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Old 06-09-2015, 12:33 PM   #2
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Does the light come on when the switch is flipped on? Could it be side mirror heaters? If it's a 120 v switch, it could be power for engine block heater.
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Old 06-09-2015, 03:06 PM   #3
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Thanks, it's not mirror heat - that's a different switch on the dash. When this rocker is switched on, there's a draw on the chassis batteries, but I can't figure out what it's powering.
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Old 06-09-2015, 03:19 PM   #4
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It may be the Battery Booster Switch.
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Old 06-09-2015, 03:27 PM   #5
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Thanks Dave, but no. The battery booster is a black plastic rocker next to the headlight switch. The switch in question is under the vent outlet near the driver's side window.
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Old 06-09-2015, 03:40 PM   #6
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Someone must have added another circuit for who knows what. I never seen a switch in that location before on an Alpine.
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Old 06-09-2015, 03:41 PM   #7
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Here's a photo of the switch.
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Old 06-09-2015, 03:47 PM   #8
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Mike,

Not OE-- at least our 2003 does not have one.
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Old 06-09-2015, 03:50 PM   #9
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Thanks Wolfe10, I was beginning to suspect that. I'll have to trace the wiring and figure it out.
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Old 06-09-2015, 03:54 PM   #10
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Probably the engine block heater. Turn it on and see if the block warms up. It should pull 11-12 amps since most are 1500 watt. It will take 30 min or so to notice any warmth on the block.
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Old 06-09-2015, 04:30 PM   #11
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Check and see if it is a master switch for your compartment lights. I have a switch near the steps for that, it has been accidentally turned on, my first clue were dead house batteries. I installed a small LED indicator lamp on the dashboard to tell me when it was left on.
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Old 06-09-2015, 05:17 PM   #12
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Ejection Seat!
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Old 06-09-2015, 05:49 PM   #13
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Not a block heater--Cummins has auto-grid heaters built in to the starting process--agree--not OEM.....
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Old 06-09-2015, 07:43 PM   #14
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It might be a noise cancelling system to prevent unwanted noise from the passenger side.

Just a thought. If it is let me know how it is installed so I can install one.
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