Most Triumph vehicles have that feature built in. There is a red or sometimes black rubber covered push switch on the starter relay mounted on the firewall next to the battery, has been on most Triumphs since the 1950's. It is a fun secret as I have seen people using an aftermarket remote start switch on Triumphs and then say "did you know you have one of those built in right here?" which is always followed by sheer amazement. Then I point to it in the Owners manual 😉 I often wondered when setting valves / timing / etc on my Heralds and TR's why most other cars did not have that feature? One skillful quick push of that switch would typically get the next valve into proper position for the feeler gauge, or when tweaking the carburetors and getting the idle too low, allow for the quick restart without having to twist the ignition key. But my Stag does not have that remote feature on the starter relay so, I have accumulated two styles of remote switches; one is a pistol grip, and one is a thumb switch. They are good for all sorts of electrical testing other than engaging the starter, like light bulbs / head light / relays / solenoids and I have used them for other various electrical checks.
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