Late Combo Gauge w/ temp ('74) wiring to a '72 Options

[Literati914]

I'm hooking up a late combo gauge from a '74, the one with a temp gauge at the top (914.641.101.50) - into my '72.

I'm a little confused with the brake warning light circuit .. the diagram below shows two BR/YL wires for the M/C (apparently) & E-brake handle switch. The '72 harness has these wires as BR/WH .. so that's obvious. But the '72 also has a third BR/WH wire going to this light from the safety belt switch. So three BR/WH wires to this light socket via a "dual spade connector". Adding these three BR/WH wires at the warning light is again, obvious. But this diagram has no mention of the BK/WH/GR wire that comes from the hazard flasher. Maybe it was accidently left off - or possibly on purpose because the '74 didn't do it that way ? (IMG:style_emoticons/default/confused24.gif) If it's recommended to add it (via a second dual spade connector), which side of the light fixture would it connect to - RD/WH or BR/WH ?

[Literati914]

Answering my own question here.. after further research, I found some mention along the lines of ‘a missing diode between generator light and brake warning light could cause the engine to not shut off’ or something along those lines. Also I found the following post from @Spoke further explaining the circuit and it sounds like the double diode set up is specific to the ‘72 model and in short is basically a safety net for the generator light burning out. Also, from the description.. it sounds like it may not be a good idea on a ‘72 to run an LED light at the brake warning spot either. Because if the current is too low there it can’t activate the generator light in an emergency. Maybe Spoke can confirm this ?