1993 Marathon F&R switch reverse voltage for lithium pack

[think7]

Am pulling out the batts today to convert this 36V to lithium and as I'm labelling everything am not clear on the connection from the bottom of the F&R switch. The cart wiring appears to match the drawing attached provided by roady89 in this thread: https://buggiesgonewild.com/showthread.php?t=927
How do I reconnect it in my new setup.
The wire (in the cart white 12-10 ga, arrowed in pink in attachment) goes to the + side of the battery at the end of the existing 36V series so it reads at max 30-32V ?
Is this a reverse safety issue to under voltage it?
Have a 36V-12V stepdown for my accessories, do I need a separate stepdown for this connection or a resistor or can I just wire it to my 36V terminal block and have a speedier reverse?
Thank you.