Headlight Relay Yes No

Not seeing it. Not saying it isn't there, just not seeing it.

I tap into 12VDC power at the battery stud on the alt or starter, doesn't matter in my case (& maybe that's why I'm not seeing it), for the high current side of the relays. I control the relays with the original light switch and Hi-Lo switch by plugging into one of the headlight sockets.

Other than control power, which I just replaced the headlight loads with relay coil loads, nothing passes thru the firewall.

If the ammeter is between the alt and the battery (been too long since I changed all of that to recall how it was), then it matters where you tap in for the current power. Needs to be on the Alt side. That assumes that the alt can keep up at idle. If not, you're screwed until you upgrade it so that it can.