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Ignition relay wiring
#11
Normally the diode in the 'I' terminal of the voltage regulator is to stop back feeding that can result in engine 'run-on'.

I include one in my Pedapter kits 'just in case it happens' but have never heard from anyone that they needed to install it.

Bob

Tachs, Voltmeters, Headlight kits, Wiper delays and more at
[Image: smlogo.jpg]
Rocketman's Classic Cougar (and Mustang) Innovations, LLC
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#12
(06-11-2019, 01:33 PM)Hemikiller Wrote: If you follow my method, you're hooking it to the starter solenoid, not the voltage regulator. I have my MSD 6AL wired like this and it works perfectly.

I forgot something. If I do how you hooked it up and connect the purple to the solenoid instead to the ignition, should I leave the ignition wire (what I supposed to hook to the purple originally) on the + side of the coil?
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#13
(06-12-2019, 10:19 PM)n_reckless Wrote:
(06-11-2019, 01:33 PM)Hemikiller Wrote: If you follow my method, you're hooking it to the starter solenoid, not the voltage regulator. I have my MSD 6AL wired like this and it works perfectly.

I forgot something. If I do how you hooked it up and connect the purple to the solenoid instead to the ignition, should I leave the ignition wire (what I supposed to hook to the purple originally) on the + side of the coil?

What does the electronic distributor manual say about power requirements to the coil?


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#14
Solid 12V. And if I'll do your method connecting the purple to the solenoid instead of the ignition what's on the coil + now I have to do something with that ignition wire.

This is the MSD relay manual: https://documents.holley.com/frm33565_re...un_add.pdf
I just chose the Pertronix relay because it's pre-wired. But pretty same wiring diagram.
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#15
What coil are you running, and what is the primary resistance of it? That is what determines the power requirement of the coil. It's possible to power the coil from the resistor wire and then supply 12 volts to the distributor via a relay. The electronics in the distributor provide a ground to the negative side of the coil, just like points, regardless of what the power input to the coil is. That way your factory tachometer will still work.

However, the relay has to remain energized on the reduced voltage from the resistor wire with the coil connected to it.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#16
(06-13-2019, 08:45 AM)Don C Wrote: What coil are you running, and what is the primary resistance of it? That is what determines the power requirement of the coil. It's possible to power the coil from the resistor wire and then supply 12 volts to the distributor via a relay. The electronics in the distributor provide a ground to the negative side of the coil, just like points, regardless of what the power input to the coil is. That way your factory tachometer will still work.

However, the relay has to remain energized on the reduced voltage from the resistor wire with the coil connected to it.

I have a Blaster II with 0.7o resistance.
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#17
(06-13-2019, 06:48 AM)n_reckless Wrote: Solid 12V. And if I'll do your method connecting the purple to the solenoid instead of the ignition what's on the coil + now I have to do something with that ignition wire.

This is the MSD relay manual: https://documents.holley.com/frm33565_re...un_add.pdf
I just chose the Pertronix relay because it's pre-wired. But pretty same wiring diagram.

In that case, then remove the original coil (+) wire, insulate and tape it out of the way. The only thing that circuit is being used for now is as a trigger for the relay. 

If you want the factory tach to work, you'll need an MSD 8920 tach adapter, or send it to Rocketman for conversion.


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#18
Yes, with that coil you'll need 12 volts.



“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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#19
Thank you all, it turned out a pretty easy thing to do. Now it starts and runs perfect.
[+] 1 user Likes n_reckless's post
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