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Open the throttle part way and see which wire has 12 v
You're going to like this diagram
Go to www.autoelectric.ru/auto/volvo/740/1989/740-89
Maybe you want to do what did, I junked the turbo+ and installed a dawes valve and a solenoid valve. Now if I want power I hit the switch on the dash and my boost level jumps from stock 7-8 psi to 14 psi (I adjusted the g-valve for 14). No more depending on the turbo+ for extra boost, it comes on when I say so.
Steve
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88 765 w/2stage boost & G-valve @ 14 psi
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