I'm installing the holley terminator efi system and I'm trying to find the best 12v switched source that has a full 12v while cranking. I have read that the "I" side of the solenoid is the best place. Do you all agree or is there a source inside under the dash?
12v switched source while cranking
66FSTBCK
1 - 12 of 12 Posts
I'm installing the holley terminator efi system and I'm trying to find the best 12v switched source that has a full 12v while cranking. I have read that the "I" side of the solenoid is the best place. Do you all agree or is there a source inside under the dash?
Joined
·
40,488 Posts
I don't think there is any switched source under the dash, other than the the power to the start (S) side of the solenoid during starting. Trouble is, unless you use a relay, it could feed back and try to operate the starter all the time. Just go with the I terminal. The solenoid IS a relay.
Thanks! "I" side it is.
Joined
·
1,854 Posts
I think it's only 12v while cranking. Otherwise, you get whatever comes through the resistor wire.
Joined
·
3,354 Posts
I'd say the I is a good place to wire it. Just like wiring it straight behind the ignition switch.
Joined
·
243 Posts
I ran a relay when I installed my HEI. I am no expert, but I could not find a good 12 volt source. With the relay it works perfect.
The_Dude is correct.
The I terminal will get back-feed from the coil (pink wire) when the engine is running - unless you install a diode to stop it. It's purpose is to supply 12V to the coil during starting.
The S terminal should only have 12V when the key is in the start position as it is the wire that 'fires' the solenoid.
The I terminal will get back-feed from the coil (pink wire) when the engine is running - unless you install a diode to stop it. It's purpose is to supply 12V to the coil during starting.
The S terminal should only have 12V when the key is in the start position as it is the wire that 'fires' the solenoid.
Joined
·
59,923 Posts
If you can deal with the current being back-fed from the coil, fine, but I'd install a fuse-protected relay switched by the "S" terminal. You know it'll be clean power and off when the key is released. Diodes can, and do, fail.
Joined
·
1,083 Posts
My MSD box is on the back of the ignition switch if I remember correctly. Or on the heater, it's been 12 years. I know the back of the switch on my Galaxie cuts off during start.
1 - 12 of 12 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
