I saw on u-tube where a mechanic was doing a compression test and had a starter relay connected to the fuse with a on and off switch , anybody know what it's called?
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Yes... You had the nomenclature perfectly...It is called "A Remote, Push Button Starter Switch" and it is used to bypass the Ordinary "KEY-ON" Starter Solenoid Activation after being connected as per these images:
These are available on Amazon from various Auto Accessory Companies:
But instead of connecting it directly to the starter solenoid like in the pic above, you could pull the starter relay in the fuse box, use a couple of small spade connectors, put the connectors in the relay slots that correspond to + and the solenoid. Or just do what I do, use a jumper wire.
Yes... You had the nomenclature perfectly...It is called "A Remote, Push Button Starter Switch" and it is used to bypass the Ordinary "KEY-ON" Starter Solenoid Activation after being connected as per these images:
These are available on Amazon from various Auto Accessory Companies: