nice investigation work !
I will try to look at the job using your ideas.
how can I view the diagram ?
when clicking, it links to the hosting site main page, and nothing else.
I saved the picture, but then I can not amplify it to read the words (and there are some I can't read).
when looking closely, here are my questions:
you do not relay the fan : hot circuit all the time, with the thermo switch being the relay ?
no horn relay ? maybe not a big deal (maybe modern horns require only a few amps to operate ?)
what's the use of the ignition relay (if you do not use the dual points sets?)
putting the lighting relay where you do, ie upstream the lighting switch, you protect the ignition switch but not the lighting switch. It might be interesting to put it downstream the switch.
I don't want to "kill your work", I am just trying to understand some of your choices to share them (or not).
thanks for the drawing.
I guess this is made to protect the ignition switch.
I am not expert enough to understand it.
not your fault, not csaba's, just my little experience on relays.
for example, I do not understand the "wiring" of spades 86 and 30 together.
it's not the first time I see it, but it's simply too clever for me.
I only understand the basics ; ground, power in, power out, signal in.
I still have to work on this, to reduce the number of items (potential trouble sources...).
1976 Fiat 124 Spider (AKA Prunette)
1971 VW 181 (Thing)