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Old 02-05-2012, 03:39 PM   #1
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Default location of 12v in engine bay?

Trying to find 12v+ in engine bay that is still on even when cranking the engine. I was using the 12v off the blue connector but that doesn't stay on when you crank the engine. Anyone know a location on the drivers side that has 12v to it even while cranking?
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Old 02-05-2012, 04:05 PM   #2
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I just run a jumper cable out the trunk up to the front. Might not be the best idea but I still can't find a +12v blue plug on my '99. '97 has one tho. No idea what still has power at crank though. I thought everything cut out on key turn. In for this info too.
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Old 02-05-2012, 04:42 PM   #3
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Quote:
Originally Posted by Techsalvager View Post
Anyone know a location on the drivers side that has 12v to it even while cranking?
'94 and later, the O2 sensor heater.

'90-'93, the blue wire going to the ignition coil (careful, it's fused at 80A.)
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Old 02-05-2012, 04:48 PM   #4
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The positive cable's nut on the back of the alternator.
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Old 02-05-2012, 04:51 PM   #5
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what are you tryin to wire up?
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Old 02-05-2012, 06:24 PM   #6
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MAF sensor
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Old 02-05-2012, 06:28 PM   #7
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Quote:
Originally Posted by TorqueZombie View Post
I just run a jumper cable out the trunk up to the front. Might not be the best idea but I still can't find a +12v blue plug on my '99. '97 has one tho. No idea what still has power at crank though. I thought everything cut out on key turn. In for this info too.
I figure the CAS, igintor, coils maybe getting 12v even with cranking just fine.
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Old 02-05-2012, 06:49 PM   #8
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Quote:
Originally Posted by sixshooter View Post
The positive cable's nut on the back of the alternator.
^This. That's where I got my power from for my LC-1. Make sure you put a fuse on it so when it strips itself on the hole you drilled through your firewall, it doesn't glow red and melt all kinds of ----. (I know from experience, that was a bad day).
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Old 02-05-2012, 08:40 PM   #9
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I didn't know you were looking for something permanent. I use the alternator nut for the timing light.
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Old 02-06-2012, 01:35 AM   #10
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Originally Posted by Techsalvager View Post
MAF sensor
Assuming you're placing it near the location of the stock MAF/AFM, why not just use the +12 supplied in the pigtail for that?
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Old 02-06-2012, 07:15 AM   #11
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Not totally sure if it's on while cranking, but I use the 12V from the AC fan relay (no AC or second fan) for a number of stuff behind the driver side headlight (transponder etc).
For the timing light, I steal juice from the headlamp H4 connector.
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Old 02-06-2012, 09:31 AM   #12
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There's a 12v+ post in the fuse box with a 10mm nut on it.
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