I have a real cluttered engine bay and the only spot I have open to mount the ignition coil is on the pass inner fenderwell. I was wondering if there was an issue mounting the ignition coil so far away from the distributor? Its a top dollar $130 msd coil and i'm running a msd digital 6 box right next to it on the fenderwell with a magnetic pickup mallory distributor.

That should be no issue but if your running old tech wiring harness remember to protect the transistors of the MPU (Micro Processing Units), that is CD Ignition Modules and Electonic Distributors with diodes across Electric Fan Relays and Alternator outputs.

to protect the transistors of the MPU (Micro Processing Units), that is CD Ignition Modules and Electonic Distributors with diodes across Electric Fan Relays and Alternator outputs.

I don't understand what the above is meaning. Would you give an example or a link to the parts needed.

Thanks, Bob

to protect the transistors of the MPU (Micro Processing Units), that is CD Ignition Modules and Electonic Distributors with diodes across Electric Fan Relays and Alternator outputs.

I don't understand what the above is meaning. Would you give an example or a link to the parts needed.

Thanks, Bob
yea i'm completely lost

The suggestion he is giving is suppressing a voltage spike when the relay coil field collapses after the relay is turned off.

A diode is placed across the relay coil terminals to suppress the spike from the field collapse. I find an 18 VDC zener works very well, limits the voltage amplitude to approx 18VDC and is above the electrical system voltage so it does not conduct, turned on , all the time.

The suggestion he is giving is suppressing a voltage spike when the relay coil field collapses after the relay is turned off.

A diode is placed across the relay coil terminals to suppress the spike from the field collapse. I find an 18 VDC zener works very well, limits the voltage amplitude to approx 18VDC and is above the electrical system voltage so it does not conduct, turned on , all the time.

Everett, VERY good suggestion. I would do the same thing. That way if you ever decided to use a 16V starter system it would still be good to go.

Witchcraft I say! Keelhaul the wench matees!
Sorry to call you a wench Everett but the only guy name I could think of was bastard. Not polite.
Back to the field collapse. Are you saying that every coil has to be protected? Every piece of modern (and old, for that matter) equipment is run by a coil/relay. I've never noticed a problem. Are you guys electronic engineers????

ok , one more dumb question. How do you put up quotes to appear in the white windows?

ok , one more dumb question. How do you put up quotes to appear in the white windows?Hit the QUOTE button at the bottom right of the post.

Older electronics is analog style and 98% of the components used filtered out the spikes, i.e., tube radios, transistor radios, sequencers, electro-mechanical devices, etc. and were not affected by the spikes or the fields collapsing.

Newer electronics, such as laptops, SBC's (single board computer), any processors, and cheap stereo equipment, rely on pure DC current and have no filtering/suppression. If there is suppression, the spike is usually of a large amplitude to wipe out the circuitry. Think along the lines of static electricity and IC's, intregrated circuits, get wiped clean. Better designed electronics have built within suppression circuits/diodes for protection. This is also the reason the stereo amp in the trunk is wired directly to the battery, a perfect filter and source of pure DC current. Other electronics should be wired the same method.

I have an '88 C3500 with auxiliary service battery connected to the main charge wire via solenoid. Turning off the ignition disabled the solenoid - an M80 went off - speaker blowout, 4 of them. I installed a diode across the solenoid coil and M80 is gone. Bought new speakers, better ones than OE.

No, I am Navy Electronics trained. Current does flow from the negative post to the positive post outside the power source. And I'm still a student in the School Of Hard Knocks.

Everett, thanks. Living where I do, I've known more than one Navy-trained electronic technician, my son included. Maybe I should be picking his brain too.

You're welcome. There you go.

Give your son a hearty "Thank you" from me for his time in the service.