I was contacted by customer asking if the start circuit for Generac model# 89A01267-s generator is a 2 wire start or transfer relay(23-194)?

SOURCE: Generac Guardian 15kW Generator

That sounds just about right, if the relay contacts get welded together it sometimes takes out the driver on the printed circuit board. As you found out, 12vdc from 23 to 194 makes the transfer switch move to the Generator position, relay not energized makes the ATS move to the Normal position.

You can make a nice test function by installing a 10 amp contact switch in series with either the N1 or N2 terminals. When the switch is open the generator thinks the Normal power has failed.

Regards,
Carl

SOURCE: wiring diagram for Generac engine on standby generator

here is a wiring diagram for that engine:

SOURCE: 10kw Generac shut down overspeed

Make sure that the throttle linkage is all there and not damaged/misadjusted, then get a manometer and check your inlet gas pressure. Gas pressure should be 8 inches of water column and stay there running or not.

Carl

SOURCE: 10kw Generac Guardian not cranking, shows rpm sense loss

Sounds like Generator mode switch should be "ON".

SOURCE: Generac 10 k battery charger installation at the

Your electrician should have run a set of wires out to the generator from the transfer switch. The unit actually comes with a fuse holder, fuse, terminal connector, and jumper wire for installing these wires to the t1 or t2 terminals in the transfer switch. The dc wires will be the ones coming out of the battery charger, 1 of them will have a red marker around it, that is your dc positive. The 2 wires coming out of the opposite side of the battery charger is actuall your ac connection.

hope this helps let me know.