brain box removal
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Senior User
Joined: Dec 2003
Posts: 222
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From: Washington State
brain box removal
my stock box on my 74 f 100 was toast,so i put an msd dist, box etc. Now I just unplugged the box. do any of these old wires from the box need to be hooked up?? there are a few wires that I have no clue what they go to?? I don't think my voltage reg is working. I put a meter on it and when I start the car and rev it up it climes to damn near 16 volts. I don't know if it did this before i switched over to the msd or not.
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Joined: Oct 2009
Posts: 6
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Hey man,
I've got a similar question and a similar thread going on. I got a few answers and they seem to agree. I'm assuming what you are calling the "brain box" is the ignition module (aluminum colored box - about 4x4) - is that correct?
Most of the answers I got said that if you are running an aftermarket 'ready to run' distributor with an aftermarket coil, then you can likely remove this box all together. Your distributor probably has three wires - one for ignition hot, one for ground, and one for the negative terminal of the coil. Wire it as such. Now, your coil MIGHT need a ballast resistor - you'll have to refer to the instructions for that (this reduces the voltage going to the coil so it doesn't burn up). If it doesn't, it just gets wired up to ignition hot as well.
Hope this helps. I haven't actually completed and ran the setup this way, but that's what I'm doing this weekend.
My thread is titled "New distributor with EXISTING ignition module" if you want to look it up.
I've got a similar question and a similar thread going on. I got a few answers and they seem to agree. I'm assuming what you are calling the "brain box" is the ignition module (aluminum colored box - about 4x4) - is that correct?
Most of the answers I got said that if you are running an aftermarket 'ready to run' distributor with an aftermarket coil, then you can likely remove this box all together. Your distributor probably has three wires - one for ignition hot, one for ground, and one for the negative terminal of the coil. Wire it as such. Now, your coil MIGHT need a ballast resistor - you'll have to refer to the instructions for that (this reduces the voltage going to the coil so it doesn't burn up). If it doesn't, it just gets wired up to ignition hot as well.
Hope this helps. I haven't actually completed and ran the setup this way, but that's what I'm doing this weekend.
My thread is titled "New distributor with EXISTING ignition module" if you want to look it up.
