Engine run-on with sniper efi

[Slowpoke86]

I feel your pain. Fire up tomorrow...

I had I running two days ago for the 1st time and it was really nice and drove great. Even today started up on the 1st crank like a champ. It ran so good it didn't want to shut off lol. I know why it stayed running I'm just having a hard time finding a straight answer on how to fix it . Some say add a diode to the wire going to the voltage regulator but everything says ( External voltage regulator) gbody oem alternators have them internal so I'm not sure if it would be the same issue and if I switch it over and add a second relay and use the same switched 12v for both relays will it back feed through the switch 12v and not allow it to shut off the snioeror would separate relays stop that. So many damn questions lol

 

[64nailhead]

Do some basic testing. The coil is getting power when it shouldn’t be.

And I’d add a temporary ground for the block to the battery.

 

[melloelky]

I don't know if this helps but I had run on with an msd years ago,I had to shut it off by holding the line lock or flipping the reverse lights on.a diode in the alt wire fixed it.

 

[Slowpoke86]

I don't know if this helps but I had run on with an msd years ago,I had to shut it off by holding the line lock or flipping the reverse lights on.a diode in the alt wire fixed it.

That wire your talking about is it the brown wire from the alternator that you put the diode in ?

 

[5spdCab]

I know power wise it will work because I have them all to one relay now and it all runs fine but the sniper trigger needs to be put to its own power. If I put them on separate relays could the one 12v switch be used for both relays.

Electrically speaking, I can't see why not. After all, both are controlled by the same (ignition) switch now. Right?

 

[Slowpoke86]

Electrically speaking, I can't see why not. After all, both are controlled by the same (ignition) switch

Electrically speaking, I can't see why not. After all, both are controlled by the same (ignition) switch now.

But would sharing it on 2 relays give me the same issue ? The problem is the ignition and distributor trigger wires are keeping the sniper trigger powered even after the key is off so sniper does not shut off. Would the sniper trigger being secluded on its own relay but sharing the 12v switch still be clean with no interference.

 

[melloelky]

That wire your talking about is it the brown wire from the alternator that you put the diode in ?

yes

 

[JAMCAR223]

Slowpoke86 I saw your thread on the Holley forum. Did you find a solution to your "run on" problem? If so, what was the ultimate fix? Did you install the diode on your internally regulated alternator?

 

[Slowpoke86]

Slowpoke86 I saw your thread on the Holley forum. Did you find a solution to your "run on" problem? If so, what was the ultimate fix? Did you install the diode on your internally regulated alternator?

Funny you came on here today and said this. I was getting ready to come post because I hate reading unfinished thread that leave you hanging lol.
Yes I added the diode to the alternator wire and it fixed the run-on issue. I used the 1amp 100 volt diode and aimed the silver line on it towards the alternator.

 

[fleming442]

Good to know. We never got to fir up last week. Trying again tomorrow. Of course, there's no gas to put in it, so that may delay things further.