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Username Post: Key on and start 12v        (Topic#349142)
lowblazer 
Forum Newbie
Posts: 2

Reg: 02-02-16
01-13-18 05:42 AM - Post#2720929    

Been lurking in the forum for a long time. I have gained so much knowledge. I have a 1960 Bel Air 4 door. 283/PG. I have been doing different upgrades, and currently I am finishing up a Sniper EFI. I am having a hard time finding a wire that has 12v on key on, and key start. Can anyone here assist me with this? My name is Eric by the way!



 
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DonSSDD 
Silver Supporting Member
Posts: 6671
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
01-13-18 06:02 PM - Post#2720973    
    In response to lowblazer

What are you using for a distributor?

Your + coil wire would have what you are looking for, unless you are using stock points. Then there is a resister wire in the harness.

You should also find a connection on the fusebox powered on by the key, if that is stock.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
lowblazer 
Forum Newbie
Posts: 2

Reg: 02-02-16
01-13-18 08:13 PM - Post#2720984    
    In response to DonSSDD

Thanks for the reply. It is still the stock points style distributor. I have checked the fuse panel, and I can find key on 12v, but not a source that is 12v on key on AND key start.



 
DonSSDD 
Silver Supporting Member
Posts: 6671
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
01-14-18 04:49 AM - Post#2720991    
    In response to lowblazer

Run one off the ignition switch wire that runs to the coil + side. At the ignition switch it puts out 12V, before it goes into the wire harness where the resistor resides.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


Edited by DonSSDD on 01-14-18 04:50 AM. Reason for edit: No reason given.

 
JayChicago 
"7th Year" Silver Supporting Member
Posts: 309
JayChicago
Loc: Chicago
Reg: 01-03-13
01-17-18 09:56 PM - Post#2721351    
    In response to lowblazer

There is no one place on your car where you can get +12V in both KEY-ON and START modes. The car was designed to keep those two circuits isolated from each other. And if you come off a source in each circuit and then join them together to feed your EFI, each circuit will back-feed the other and cause problems. (like the starter continuing to run in KEY-ON)

I would think you should talk to the EFI supplier; seems like they would have figured out an easy solution. It probably needs to be done using one or two relays. (when a relay springs open, it prevents back-feeding into its circuit)

Another point: To be safe you want your new +12V feeds to be fused. The ignition switch on our cars is ahead of the fuses, so not a good source. The fused source you found at your fuse panel would be good for KEY-ON. And on our old cars the START circuit does not go thru the fuse panel, it is not fused at all! So nothing lost if you tap the START circuit at the ignition switch, but your new feed should then have an in-line fuse within the first few inches.



 
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