[Smith1000]

I am reading some wiring diagrams. I noticed today that sometimes the tach signal drops out yet the power doesn't cut out. Other times the engine ignition power cuts out all together engine and tach read drops out also. It is intermittant and is off then back on for long spells. Looks like the tach signal does not run through the PCM per the wiring diagrams. Says white wire goes to instrument cluster directly to the tach from the ignition module. I know my crank pos sensor and cam pos sensor are good. I replaced them about 2 months agao. I think the ignition module is intermittantly losing its power source at the relay center or at the "hot at run" position in the ignition switch. Book says power source is the pink wire, fuse 6, 20A (relay center). Grounds are good as I cleaned them a while back. I bet it is powering out at this relay. I'll find the relay and take a look at it or swap it out. I may run a test bulb into the cab to see what the pink wire source of power does when it cuts out. The bulb will probably go off too. I hope it is the fuse and not the ignition switch in run position. I think to replace the ignition switch, the steering wheel must come off.