Way Outta Control
Join Date: Sep 1999
Location: The Palouse
Thanked 3 Times in 3 Posts
Re: jeep still not running-electrical question (LEVE?)
JeepAir may have pegged this one... but it could also still be a wiring error or a problem with the ignition switch.
When the ignition is in the ON mode a full 12 volts is connected to the coil. This aids in starting cold engines by giving a "hotter" spark. Unless the coil is a special coil constructed to take a full 12 volts this amount of voltage will overheat the coil, and it will die from the heat.
To avoid this problem when rotate the ignition switch back to RUN mode a means of lowering the Coil voltage is switched in. This is done in one of two ways...
a. A resistor. It's normally mounted on the firewall for a head-sink, sandy or gray in color and looks like ceramic.
b. A resistor wire. A few feet of this wire is put between the 12 volt source and the coil. This wire has the resistor built into the wire. So you buy the right amount and splice it in the power lead and you're dropping the reistance to the coil..
In each case the value is 1.35 ohms, and it's pretty standard. Places like NAPA should carry the stuff. Yep, because it resists voltage, this wire can get warm. Better it than your coil.
Measure the voltage on the coil in start. It should be about 12 volts.
Measure the voltage on the coil in run. It should measure about 8.4 volts.
If no voltage is there... then you've got an open reistance. The voltage can't get to the coil. Then you'll just have to trace the lead back from the coil, or foward from the igniion switch to find out why no voltage is going to the coil.