I think i figured it out through some research.
The positive 12 volts passes through a normally open 4th gear 2 prong pressure switch, which then goes to the lockup solenoid(single wire self earthing).
The disconnected (normally closed) single prong pressure switch located next the lockup solenoid is for a 2 wire solenoid which would earth to this switch.
I can only assume that pressure port is when the kickdown is or about to be operated. I guess to reduce load on the lockup disengaging prior to downshift.
Ideally i should get a 2 wire solenoid to replace my currently burnt out single wire solenoid.
I’m still looking into where to source a adjustable vacuum switch. As my car is cam’d and blown I will need something i can adjust accordingly
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This reply was modified 9 years, 6 months ago by SouthRidge.