/wwwthreads_images/icons/smile.gif As one of my more astute moonguys/wwwthreads_images/icons/wink.gif pointed out.....you DON'T WANT the choke heater to heat the choke until the engine is actually running. Like if you flipped on the key and just sat there, you would not want the choke to heat up...pull off...and not be there to give you a good startup. SO....they used OIL PRESSURE....a sure and certian indiaction that the engine is running. Oil pressure is used in MANY applications...Caterpillar uses it to start the alternator charging...it is often use to kick out the A/C clutch until after the engine is started...LOTS of things. We have a ten-unit relay group set up for our CJ, and a crapload of the circuits depend on oil pressure, like the FOG LIGHTS, the A/C clutch, the rear defroster, the theft system disables fuel if the engine starts, oil pressure rises, and the theft system is still on "safe", and oh yeah, the alternator is energized by a relay which is oil pressure dependent./wwwthreads_images/icons/crazy.gif
Quadra-Trac modified by the crack moonguy/wwwthreads_images/icons/wink.gif/wwwthreads_images/icons/smile.gif/wwwthreads_images/icons/tongue.gif transfer case team.