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Ive got the same thing to wire ( fan ) but was going to use the choke switch as the over ride,not sure if the switch contacts are up to it ?
Choke switch? You mean that daft little thing that (in theory) puts the choke light on which clips round the choke cable?
It can probably handle the current since it's only switching the relay, but it won't do the job since it's a spring loaded "push to make" switch except it's actually push to open, the default position is on! Rather like a brake light switch, but smaller.
I guess the thinking is to use the choke warning light, redundant on an EFI car, to represent the fan over-ride. I've used mine for the "Sport Mode" warning light on the transmission, by the same bit of lateral thinking. Be aware that the warning light is ign live powered so the switch is earthed. Changing this to earth inside the warning light display is tedious and difficult, but can be done. Ask me how I know! I did the mod then found out I needn't have bothered as the sport mode light wire needs power, not earth! This mistake fried the trans ECU and I had to buy another, we live and learn!
Steve