CK5
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me dumb
- Thread starter PeteH
- Start date
74757685k5
1/2 ton status
in the cap on 74 and newer .
tbi is bolt on to the intake. 
so the msd type (blaster coils) are just external ignition coils?
..reason i ask, i got some msd stuff, the dizzy, ignition box and blaster coil for cheap and now i just wanna put them on my engine. i have the wiring but i was just seeing where i should mount the coil. and also do the + heavy red and - heavy black wires attatch directly to the batt?
..reason i ask, i got some msd stuff, the dizzy, ignition box and blaster coil for cheap and now i just wanna put them on my engine. i have the wiring but i was just seeing where i should mount the coil. and also do the + heavy red and - heavy black wires attatch directly to the batt?
adapter
I think its MSD who makes an adapter that lets you use an external coil on an HEI distributor cap..looks like part of the cap,with a sparkplug porcelain thing sticking out of it ,that the coil wire plugs onto..look in Jeg's or Summit's catalog,you'll see it..
I think its MSD who makes an adapter that lets you use an external coil on an HEI distributor cap..looks like part of the cap,with a sparkplug porcelain thing sticking out of it ,that the coil wire plugs onto..look in Jeg's or Summit's catalog,you'll see it..
Huh???
..I doubt that will work!.. what's going to tell the external coil when to fire??...it cant guess by itself,and a pick up coil needs the module to sense the magnetic impulses when the reluctor spins,and tell the coil when to fire..!..
The adaptor thing I mentioned just goes in place of the coil cap on an HEI distributor--it simply connects the high tension wire from the external coil to the center post in the distributor cap..the coil needs the module and pickup coil to tell it when to spark,just like the points did on the old style distributors..
I think you'd gain more by buying a higher output HEI style coil,rather than go to an external style myself..might as well put a points distibutor in if your going to do that..
..I doubt that will work!.. what's going to tell the external coil when to fire??...it cant guess by itself,and a pick up coil needs the module to sense the magnetic impulses when the reluctor spins,and tell the coil when to fire..!..The adaptor thing I mentioned just goes in place of the coil cap on an HEI distributor--it simply connects the high tension wire from the external coil to the center post in the distributor cap..the coil needs the module and pickup coil to tell it when to spark,just like the points did on the old style distributors..
I think you'd gain more by buying a higher output HEI style coil,rather than go to an external style myself..might as well put a points distibutor in if your going to do that..
so can i just splice off the electric choke wire and connect it"key connector" , or is that wire only on at cranking? it says the heavy red, but i have a billion coming out of my firewall and i cant get very far(taking off column), i even tried to find pink but i cant seem to find it either.
Cornfield creations
1/2 ton status
I say rather than tryin to rig it all together and hoping it works, and finding out it doesn't and having to fix the distributor. Sell what you got, buy a super coil and put it on there. 
beater_k20
Banned
seriously, if you cant grasp a simple mod like this you need to step back and rethink things very carefully. there's alot of things you could potentially screw up. you said you had an MSD distributor as well, right? removing and installing the distributor isnt a very easy task for a novice as yourself, and setting ignition timing can be a problem too. maybe you should look at taking it somewhere and having the stuff installed, and starting with smaller projects, rather than tackling something so vital to the truck's drivability right off the bat.
BTW, the keyed + wire in question should come from your coil +.
BTW, the keyed + wire in question should come from your coil +.
I believe the one labeled "Key connector" is the connector that used to plug into your distributor cap. It should have switched ignition in it. You shouldn't have to run anything up from the cab.
Unless you have experience making custom harnesses, I recommend you just buy the adapters from MSD. You'll need This Harness. The diagram you posted is just for replacing the in-distributor module with the MSD box.
To run the external coil, you needThis cap cover. Then the orange and black wires go to the external coil instead of back to the distributor cap. You will also need a short plug wire to go from the coil to the new cover.
This isn't real difficult, you will just need the right conversion parts from MSD or it will be a hack job. Without good harnesses, the system will be unreliable and therefore worse than stock.
Unless you have experience making custom harnesses, I recommend you just buy the adapters from MSD. You'll need This Harness. The diagram you posted is just for replacing the in-distributor module with the MSD box.
To run the external coil, you needThis cap cover. Then the orange and black wires go to the external coil instead of back to the distributor cap. You will also need a short plug wire to go from the coil to the new cover.
This isn't real difficult, you will just need the right conversion parts from MSD or it will be a hack job. Without good harnesses, the system will be unreliable and therefore worse than stock.
