Where can I find a 12V PS in the engine bay? - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 05-05-2004, 12:47 AM
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Where in the engine bay can I find a 12V power supply that only turns on and off with the ignition? I'm trying to frind a PS for my electric engine fan.

Any ideas?

thanks,

Bryan

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#2 (permalink) Old 05-05-2004, 02:17 AM
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I'm trying to think of something that could handle the added stress on line but Im not coming up with much. What about tapping the line off the cruise control module?

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#3 (permalink) Old 05-05-2004, 02:18 AM
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better yet, the horn.

EDIT: on second thought, that might not work, unless you drove around with the horn on all the time.

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#4 (permalink) Old 05-05-2004, 02:37 AM
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You could try disconnecting your lighter and run it through there but do not quote me on this it's just a thought.

Or would that not swithck off with the ignition
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#5 (permalink) Old 05-05-2004, 05:14 AM
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1. Don't have cruise control, so won't work.

2. Horn only uses 12V power when you press it, so won't work.

3. Lighter wouldn't work either since it's a constant 12V supply. Plus I want to avoid wiring to the interior.

Anything else in the engine bay I could wire it to?

Thanks guys,

Bryan

<u>1994 M-Technic M42 Saloon - Trillium Chapter - 5130</u>
Stock - 2866lbs Current - 2670lbs
<a href='http://www.geocities.com/mtechnik42' target='_blank'>- VIEW MY MODS AND PICS</a>
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#6 (permalink) Old 05-05-2004, 11:51 AM
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What about taping something at the fuse box.
perhaps put the fan on a thermal switch of some kind?

checke the horn power. you maybe able to tap the horn power and ground to the frame if its hooked up so that when you press the horn it just grounds the rest of the horn circuit making it sound..

um. fog lights? parking lights? they are switched.

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#7 (permalink) Old 05-05-2004, 01:32 PM
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if nothing else you could power it from the positive bat terminal, but you would need a switch somewhere.

Just had another idea. What about the temp sensor?

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#8 (permalink) Old 05-05-2004, 01:37 PM
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Hey guys,

Thanks for all the suggestions.

I think I'm going to use my headlights. I have a model BMW where I don't have daytime running lights. However, my low beams are always on reguardless of what setting I use. So I assume this would work then? If so, which wire is the +ve PS for the low beam headlight?

Thanks!

Bryan

<u>1994 M-Technic M42 Saloon - Trillium Chapter - 5130</u>
Stock - 2866lbs Current - 2670lbs
<a href='http://www.geocities.com/mtechnik42' target='_blank'>- VIEW MY MODS AND PICS</a>
<a href='http://www.automobile-technik.com' target='_blank'>- PARTS FOR SALE</a>
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#9 (permalink) Old 05-05-2004, 02:41 PM
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Make a new 12V power line to the engine bay. When tapping it from the headlights or something else, the headlight fuses cannot run this.

A new power line --> always install a fuse into it!!

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#10 (permalink) Old 05-05-2004, 02:44 PM
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Quote:
Originally posted by dutchbmw@May 5 2004, 02:21 PM
Make a new 12V power line to the engine bay. When tapping it from the headlights or something else, the headlight fuses cannot run this.

A new power line --> always install a fuse into it!!
Hah thanks man.

I just went outside to do this. I tapped it into the headlights and I blew the fuses 2 times!

I'm confused though, what do you mean run a new 12V PS? From where?

thanks,

Bry

<u>1994 M-Technic M42 Saloon - Trillium Chapter - 5130</u>
Stock - 2866lbs Current - 2670lbs
<a href='http://www.geocities.com/mtechnik42' target='_blank'>- VIEW MY MODS AND PICS</a>
<a href='http://www.automobile-technik.com' target='_blank'>- PARTS FOR SALE</a>
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#11 (permalink) Old 05-05-2004, 02:45 PM
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You could always duct tape a new battery to your hood and use that as a power supply. It should last a while......

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#12 (permalink) Old 05-05-2004, 02:47 PM
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Quote:
Originally posted by camnipotent@May 5 2004, 02:25 PM
You could always duct tape a new battery to your hood and use that as a power supply. It should last a while......
Errr.. you must be joking!

The electric fan kills my stock battery if I leave it on for more than 5 seconds!

<u>1994 M-Technic M42 Saloon - Trillium Chapter - 5130</u>
Stock - 2866lbs Current - 2670lbs
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#13 (permalink) Old 05-05-2004, 02:50 PM
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Err...I am. I have yet to think of a 12V source....give me time.

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800 Watt 2-Way Rockford Fosgate Amplifier</span></span>
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#14 (permalink) Old 05-05-2004, 02:52 PM
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Originally posted by camnipotent@May 5 2004, 02:30 PM
Err...I am. I have yet to think of a 12V source....give me time.
:P

Thanks, I apprecaite it

Bry

<u>1994 M-Technic M42 Saloon - Trillium Chapter - 5130</u>
Stock - 2866lbs Current - 2670lbs
<a href='http://www.geocities.com/mtechnik42' target='_blank'>- VIEW MY MODS AND PICS</a>
<a href='http://www.automobile-technik.com' target='_blank'>- PARTS FOR SALE</a>
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#15 (permalink) Old 05-05-2004, 02:52 PM
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This might as well be a chat room.

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