Keyed 12v source. - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Chevys10dr · 09-08-2015, 11:09 PM

Not the greatest at wiring, need help.

running an MSD box and Atomic EFI, I need to have a 12v source for both that supplies 12v in "on" and "start".

where would i start to find this?

toolboxchev · 09-08-2015, 11:50 PM

Off the fuse panel under the dash. Just check which ones are keyed on with a multimeter or DVOM.

Pretty simple

boynton · 09-08-2015, 11:53 PM

Back of the switch. Purple will be your starter and pink should be you key on. Easiest way to double check it a cheap test light. There are also key on spots in the fuse box. You can also pick up a low voltage starter wire from your starter. I would not do this because you could cause your starter to burn up due to a lack of power since you are picking it up so close to the starter.

Chevys10dr · 09-08-2015, 11:58 PM

Every open spot in the fuse box it shuts off the EFI when cranking the engine over. So i think they only supply in the "on" position.

boynton · 09-09-2015, 12:05 AM

Quote:

Originally Posted by Chevys10dr

Every open spot in the fuse box it shuts off the EFI when cranking the engine over. So i think they only supply in the "on" position.

Very possible. Try the back of the switch. I think the key on gives you power the whole time.

Chevys10dr · 09-09-2015, 12:21 AM

I will check the pink wire, hope it has power on both start and on. If no I will have to run a wire off the battery to a toggle switch.

09-08-2015, 11:09 PM	#1
Chevys10dr Registered User Join Date: Feb 2008 Location: Fort McMurray, AB Posts: 192	Keyed 12v source. Not the greatest at wiring, need help. running an MSD box and Atomic EFI, I need to have a 12v source for both that supplies 12v in "on" and "start". where would i start to find this?

09-08-2015, 11:50 PM	#2
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: Keyed 12v source. Off the fuse panel under the dash. Just check which ones are keyed on with a multimeter or DVOM. Pretty simple

09-08-2015, 11:53 PM	#3
boynton Registered User Join Date: Feb 2012 Location: Salado, Texas Posts: 1,415	Re: Keyed 12v source. Back of the switch. Purple will be your starter and pink should be you key on. Easiest way to double check it a cheap test light. There are also key on spots in the fuse box. You can also pick up a low voltage starter wire from your starter. I would not do this because you could cause your starter to burn up due to a lack of power since you are picking it up so close to the starter. __________________ Just trying to figure this out... 1970 SWB Step-Side http://67-72chevytrucks.com/vboard/s...d.php?t=552980 1970 LWB http://67-72chevytrucks.com/vboard/s...d.php?t=584499 1970 SWB One Owner Step Side 6.0 LY6/6L90 http://67-72chevytrucks.com/vboard/s...d.php?t=617630 Junkyard's 1971 short wide http://67-72chevytrucks.com/vboard/s...86#post7531186

09-08-2015, 11:58 PM	#4
Chevys10dr Registered User Join Date: Feb 2008 Location: Fort McMurray, AB Posts: 192	Re: Keyed 12v source. Every open spot in the fuse box it shuts off the EFI when cranking the engine over. So i think they only supply in the "on" position.

09-09-2015, 12:21 AM	#6
Chevys10dr Registered User Join Date: Feb 2008 Location: Fort McMurray, AB Posts: 192	Re: Keyed 12v source. I will check the pink wire, hope it has power on both start and on. If no I will have to run a wire off the battery to a toggle switch.



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