I have a TCM w/ a K25 cranks but will not start, if i introduce a secondary fuel supply it will run. I have traced it to (i believe) the #11 wire(yellow) coming out of the large plug on the ECM, it goes to the LPG assist solenoid and has battery voltage all the time when the ign is on. The other wire to solenoid is a brown that comes from all the EGI relays and is also batt voltage. Is the yellow wire suposed to switch polarity in order to work the assist sol?
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