Monday 28 May 2018 at 22:17
First thing to check would be to make sure there is a diode across the relay coil, and to make sure the polarity is correct. The diode protects upstream components from damage if the circuit is stuck on.
In theory, the GI relay cannot be blown by simply plugging it in. The GI must flash, and that...
Source: http://pinside.com/pinball/forum/topic/jokerz-gi-relay-driving-transistor#post-4422796