Notices
MEGAsquirt A place to collectively sort out this megasquirt gizmo

location of 12v in engine bay?

Old Feb 5, 2012 | 02:39 PM
  #1  
Techsalvager's Avatar
Thread Starter
I'm Miserable!
 
Joined: Jun 2009
Posts: 1,866
Total Cats: 0
From: albany, ga
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?
Thanks
Old Feb 5, 2012 | 03:05 PM
  #2  
TorqueZombie's Avatar
Elite Member
iTrader: (6)
 
Joined: May 2011
Posts: 1,656
Total Cats: 64
From: Albuquerque, NM
Default

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.
Old Feb 5, 2012 | 03:42 PM
  #3  
Joe Perez's Avatar
Boost Pope
iTrader: (8)
 
Joined: Sep 2005
Posts: 34,402
Total Cats: 7,523
From: Chicago. (The less-murder part.)
Default

Originally Posted by Techsalvager
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.)
Old Feb 5, 2012 | 03:48 PM
  #4  
sixshooter's Avatar
Moderator
iTrader: (12)
 
Joined: Nov 2008
Posts: 22,204
Total Cats: 3,560
From: Tampa, Florida
Default

The positive cable's nut on the back of the alternator.
Old Feb 5, 2012 | 03:51 PM
  #5  
jared8783's Avatar
Senior Member
iTrader: (2)
 
Joined: Aug 2010
Posts: 397
Total Cats: 4
Default

what are you tryin to wire up?
Old Feb 5, 2012 | 05:24 PM
  #6  
Techsalvager's Avatar
Thread Starter
I'm Miserable!
 
Joined: Jun 2009
Posts: 1,866
Total Cats: 0
From: albany, ga
Default

MAF sensor
Old Feb 5, 2012 | 05:28 PM
  #7  
Techsalvager's Avatar
Thread Starter
I'm Miserable!
 
Joined: Jun 2009
Posts: 1,866
Total Cats: 0
From: albany, ga
Default

Originally Posted by TorqueZombie
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.
Old Feb 5, 2012 | 05:49 PM
  #8  
thirdgen's Avatar
Slowest Progress Ever
iTrader: (26)
 
Joined: Oct 2007
Posts: 6,029
Total Cats: 304
From: The coal ridden hills of Pennsylvania
Default

Originally Posted by sixshooter
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).
Old Feb 5, 2012 | 07:40 PM
  #9  
sixshooter's Avatar
Moderator
iTrader: (12)
 
Joined: Nov 2008
Posts: 22,204
Total Cats: 3,560
From: Tampa, Florida
Default

I didn't know you were looking for something permanent. I use the alternator nut for the timing light.
Old Feb 6, 2012 | 12:35 AM
  #10  
Joe Perez's Avatar
Boost Pope
iTrader: (8)
 
Joined: Sep 2005
Posts: 34,402
Total Cats: 7,523
From: Chicago. (The less-murder part.)
Default

Originally Posted by Techsalvager
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?
Old Feb 6, 2012 | 06:15 AM
  #11  
NiklasFalk's Avatar
Senior Member
iTrader: (1)
 
Joined: Jun 2006
Posts: 1,391
Total Cats: 63
From: Sweden
Default

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.
Old Feb 6, 2012 | 08:31 AM
  #12  
m2cupcar's Avatar
Elite Member
iTrader: (5)
 
Joined: Jan 2005
Posts: 7,486
Total Cats: 372
From: Atlanta
Default

There's a 12v+ post in the fuse box with a 10mm nut on it.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
19
Jan 8, 2021 11:24 AM
nbdooey
Miata parts for sale/trade
9
Aug 30, 2017 09:50 PM
nick470
MEGAsquirt
7
Jun 16, 2017 01:53 PM
Frank_and_Beans
Supercharger Discussion
13
Sep 12, 2016 08:17 PM


Thread Tools
Search this Thread

All times are GMT -4. The time now is 09:23 PM.