Quote Originally Posted by 36 sedan View Post
Sorry, got to go to band practice, I'll have to resume this tomorrow.
Look closely at the diagrams, the ground is set by relay #1 when the door jam switch engages which latches relay #1 to ground through 30 $ 87, this in turn activates and hold relay #2, #2 supplies the 12VDC+ to the horn through 30 & 87, the horn grounds directly. Switch interrupts the latch, starting the circuit over.

Here it is with a delayed entry/exit;
Without a ground on the end of the coil the relay will never energize unless 87 and 87a are reversed and with the toggle switch closed how do you get power to the positive side of the coil?