Hot wire when motor is running? - BMW Luxury Touring Community
 
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post #1 of 9 Old Jun 8th, 2009, 5:55 am Thread Starter
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Hot wire when motor is running?

I want to wire my lights to run off a relay that's hot only when the motor is running, so I need to switch the relay with a wire that is only hot when the motor is running. I was told that the wire to the heated seats is hot only when the motor is running, but I can seem to find it. All the wires I find to the seats are hot when the ignition is switched on. Does anyone know a wire that is hot only when the motor is running?

******

Al Strickland
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1967 Honda Cub
1972 Honda CB350
1979 Suzuki GS750E
2001 R1150GS (gone -- victim of a Highway 28 curve)
2002 K1200LT Trike (now history, transmission died)
2009 R1200GS
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post #2 of 9 Old Jun 8th, 2009, 6:22 am
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Re: Hot wire when motor is running?

Another good one to use is the headlight wire. You can use the low beam for running lights, like PIAA's 1100's under the fairing, and the high beam for auxillary lights, like some HID's.
The seat wire is really easy to find though, and you can definitely use that one as well. Just a thought, but you could run a fuse block off the battery, relayed to the seat wire to power the lights.

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post #3 of 9 Old Jun 8th, 2009, 7:01 am
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Re: Hot wire when motor is running?

As far as I know there is NOT a wire that is hot ONLY with the motor running. Only some hot all the time and others hot when ignition switch is on. I tied into the rear seat heater and it works well to trigger the relay.

Stevie Shreeve
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post #4 of 9 Old Jun 8th, 2009, 9:26 am
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Re: Hot wire when motor is running?

Quote:
Originally Posted by katnapinn
As far as I know there is NOT a wire that is hot ONLY with the motor running. Only some hot all the time and others hot when ignition switch is on. I tied into the rear seat heater and it works well to trigger the relay.
How about adding a second relay? A 'normal on' relay triggered by the alternator warning light used to break the circuit that energizes the relay that powers the lights. So when the alternator light comes "on" that relay is energized and turns off the electrons to the lights' 'normal off' relay.

Motor On ,/'


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post #5 of 9 Old Jun 8th, 2009, 9:33 am
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Re: Hot wire when motor is running?

There probably is a hot wire for the radiator fans - I'm pretty sure when I kill the engine my fans shut off.
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post #6 of 9 Old Jun 8th, 2009, 10:06 am
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Re: Hot wire when motor is running?

Quote:
Originally Posted by Caveno
There probably is a hot wire for the radiator fans - I'm pretty sure when I kill the engine my fans shut off.

Nope. The fans are tied to the ignition as well.

Sounds like to you need to add a relay and a switch for the lights.

Tim Barstow

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post #7 of 9 Old Jun 8th, 2009, 12:03 pm
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Re: Hot wire when motor is running?

Quote:
Originally Posted by jkersh1
How about adding a second relay? A 'normal on' relay triggered by the alternator warning light used to break the circuit that energizes the relay that powers the lights. So when the alternator light comes "on" that relay is energized and turns off the electrons to the lights' 'normal off' relay.
Brilliant! Now there's a thinking man! Neat idea.
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post #8 of 9 Old Jun 8th, 2009, 12:51 pm Thread Starter
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Re: Hot wire when motor is running?

My thoughts exactly. Now the $54,000 question-- Is there a wire to the alternator light or is it on a printed circuit board?....

Quote:
Originally Posted by jkersh1
How about adding a second relay? A 'normal on' relay triggered by the alternator warning light used to break the circuit that energizes the relay that powers the lights. So when the alternator light comes "on" that relay is energized and turns off the electrons to the lights' 'normal off' relay.

******

Al Strickland
Blairsville, Georgia
1967 Honda Cub
1972 Honda CB350
1979 Suzuki GS750E
2001 R1150GS (gone -- victim of a Highway 28 curve)
2002 K1200LT Trike (now history, transmission died)
2009 R1200GS
2013 K1600GTL
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post #9 of 9 Old Jun 8th, 2009, 8:08 pm
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Re: Hot wire when motor is running?

Quote:
Originally Posted by alstrickland55
My thoughts exactly. Now the $54,000 question-- Is there a wire to the alternator light or is it on a printed circuit board?....
From my recollection of my one dis-assembly of the instrument cluster, the bulbs/mushysockets are attached to a wire to permit bulb changes.

Motor On ,/'


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