Bronco Forum - Full Size Ford Bronco Forum banner

1 - 6 of 6 Posts

·
Registered
Joined
·
9 Posts
Discussion Starter #1
Did you run your coil off the battery or did you use a switched 12V source.
I have been collecting information off of various sites and have a multitude
of information on how to connect the HEI module but when it comes down
to the coil connection it gets vague on how they made their connection.
 

·
Registered
Joined
·
9 Posts
Discussion Starter #3
Do you have a full 12V running to the coil?
I will be placing a TFI coil in with the HEI mod.
Using a voltmeter I have 11.5 volts at the original
coil wire and a steady 12V at the control box power wire.
Where is the resitor wire that i keep hearing about that is
used to power the original coil down to 9V?
 

·
House of Windsor 4ever!
Joined
·
10,511 Posts
It's inline with the wire that gives you the lower power at the coil, inside the wiring harness.
 

·
Registered
Joined
·
455 Posts
Do you have a full 12V running to the coil?
I will be placing a TFI coil in with the HEI mod.
Using a voltmeter I have 11.5 volts at the original
coil wire and a steady 12V at the control box power wire.
Where is the resitor wire that i keep hearing about that is
used to power the original coil down to 9V?
My 78 has the resistor wire coming from the ignition switch,
under the dash. It's a gray wire about 6-8" long with the
word RESISTOR printed on it. If you're running an oil-filled coil
the resistor should be left in place; if running an E-coil then the
resistor wire can be bypassed with a jumper to give full battery
voltage.
 

·
Registered
Joined
·
201 Posts
This drove me nuts too. My HEI directions said that the HEI had to have full alternator voltage with no resistor. So I ended up running my keyed 'on' wire to a heavy duty relay instead of directly to the HEI. That way I know the HEI is getting full current. It's worked great.

By the way, I did a water crossing last weekend that would have surely shut down my old Duraspark ignition. It's a long story, but the hole I was forced to go through had about a 6' long 4' deep section. Water briefly came over the front of the hood. I fully expected it to soak my ignition, but she never missed a beat and I ended up just motoring on up the trail. When I stopped about a mile down the trail I saw all the slime and grass stuck to the front of the rig, so I lifted the hood to check things out in the engine compartment. I had slime and grass all over the place including on top of my intake manifold, just below the base of the carburetor. I think that because the HEI's base sits about 3" higher than the factory distributor's did, (not to mention the Ford coil which used to sit right on top of the intake manifold), it kept my ignition out of the water. This is certainly not something I ever considered when I swapped, but that extra height is definitely a good thing in a water scenario.

And yes, I have my axles, gearboxes and fuel tank vented high so that I don't suck water into them when crossing creeks.

Screamin':thumbup
 
1 - 6 of 6 Posts
Top