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quick question: ignition wires

volvo940tuner

volvo940tuner

New member
Joined
May 14, 2006
Location
BOOSTIN', massachusetts
Quick question! I am trying to splice into a SWITCHED 12v power source to power up my AEM UEGO, what color wire on the ignition switch would suffice? I know the two large red wires are constant 12v power, but I need switched. IIRC, the SWITCHED 12v power is blue or green? This is in my '90 744 TiC. Thanks.
 
Come off a fuse in the fuse box, not igintion switch. Use test light or VM to test each fuse. There are switch & unswitched fuse in FB BTW
 
if its anything like my LC1...it will reset and warm the sensor up each time power is lost. so dont use an accesory fuse.....find like the coil power which will be hot in the on position...but still hot while cranking so it wont reset. this way too you can have the radio on and your wideband will be off.
 
Nathaninwa said:
if its anything like my LC1...it will reset and warm the sensor up each time power is lost. so dont use an accesory fuse.....find like the coil power which will be hot in the on position...but still hot while cranking so it wont reset. this way too you can have the radio on and your wideband will be off.
Click to expand...

That's a good idea! I was wondering in addition is noise an issue on the source power with the wideband or is it something I shouldn't worry about?
 
i think its a non issue.....just make sure you ground them really well with bigger wire than required.....like 14g to the engine block. thats whats important. solder all joints
 
Interesting. It says to wire the power of the gauge to a switched 12V power source that utilizes a 10A fuse. Any thoughts or should I just start looking at the fuse box with a test light and see which 10A slot gets power when the key is in the third position?
 
(-) -> switch -> device.
(+) -> fuse -> device.

done.

(this is taking power directly off of the battery). Honestly, I wouldn't bother trying to jumper it off of anything. Too much trouble vs the price of copper ;-)
 
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