Battery to trunk-would this work?

What I did was install a Normally-Open relay into the Isolated Field wire charge circuit. As soon as I pull the handle, the relay de-powers and opens the field circuit, and the alternator powers down. That circuit does not draw much so I just used a small relay. I also run my Ignition off a relay.
I installed those about 20 years ago. I think this does NOT meet NHRA rules but IDK for sure. I just use my car on the street, and no electric pump.