I'd expect the "GM type" to be in relation to physical configuration, like how it mounts .... if you're trying to have the LEDs activated by either/both the jamb switch or the dome switch you'll have a problem - the jamb sw would need the dome sw on to work and the reverse too .... suggest getting a switch best physically suited and use it to ground the LEDs when open, with a toggle under the edge of the dash to add the ground when the door is closed [fused plus to the LEDs] .... you want a single pole, single throw toggle [which has 2 terminals], and a normally closed jamb sw, which also has 2 terminals] that will open the circuit when depressed

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir
"When we tug a single thing on an old truck, we find it falls off" ~ me
Some TF series details & TF heater pics