Can I wire it off the MSD 7 AL 2 box

the switch needs to break the starter switch wire that goes to starter solenoid

The type of shifter switch makes a difference. If the shifter switch is capable of handling the amperage required to engage the starter solenoid
you can simply make a loop from the starter switch to the shifter switch to the starter solenoid. Use at least 14ga quality wire.

and use a relay

Was wondering if I need to go to the starter solenoid on the motor or the ford remote solenoid I have on the firewall. but can the ignition on the switch go to the ignition post on the MSD 7 AL 2

They want it to not crank
so going to that terminal won’t let it

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start but it will still crank

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Originally posted by JCDRAGS:
Was wondering if I need to go to the starter solenoid on the motor or the ford remote solenoid I have on the firewall. but can the ignition on the switch go to the ignition post on the MSD 7 AL 2

Since I bump the starter to check valves and to locate TDC, the last thing I would do is have a requirement that the ignition switch has to be on for me to move the engine.

Joe

Ignition is wired separately so you can either turn engine for valve adjusting and such or spin it before triggering ignition. for starting.
Factory GM style starter solenoids require a heavy wire as they draw more amperage then a Ford style remote solenoid. Most shifters use a light duty switch for NS that is not made to handle the higher amperage of a GM starter solenoid and the heavy gauge wire. much simpler, cleaner and more reliable to wire through a relay or a Ford style solenoid used as a relay.

If using the ford solenoid on my firewall how do I wire that in, then the start switch on the auto rod control. there is a remote start switch also on the firewall.I believe the one wire goes to the left terminal on the solenoid looking at the firewall to the left, where would I tie in the start switch??

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and use a relay

AGREED if you don’t have a relay board with starter option. Here’s how I’d do it using a relay.

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Originally posted by JCDRAGS:
If using the ford solenoid on my firewall how do I wire that in, then the start switch on the auto rod control. there is a remote start switch also on the firewall.I believe the one wire goes to the left terminal on the solenoid looking at the firewall to the left, where would I tie in the start switch??

There are basically 2 ways to wire in a Ford starter solenoid. The most common way is to use the Ford solenoid as a control for the heavy gauge battery cable running to the GM starter. Instead of running the cable directly to the starter you run it to the Ford solenoid first and then from the Ford solenoid down to the GM starter. For this to work you need to make a jumper from the main post on the GM starter solenoid to the small trigger post on the GM solenoid. This way the main cable down to the GM starter isn't hot until you push the starter button. It works well but does add another solenoid handling high amperage to the starter system and depending on the starter may cause the GM starter to stay engaged for a second or 2 after you release the starter button, not all starters are effected.
Method 2 is to use the Ford starter solenoid as a relay for the GM starter trigger wire similar to how Markemark's diagram. When doing it with a Ford relay you would run your heavy battery cable to the Ford relay and connect the heavy cable going to the GM starter to the same post so it is hot all of the time. Then you run a 10 or 12ga wire from the other heavy terminal of the Ford solenoid down to the trigger wire of the GM starter.
My car is wired with the first most common use of a Ford solenoid using the jumper on the GM starter. it's worked this way for decades. But every part on a racecar can be prone to failure and it's one more part to fail.