'89/2.9l LOW VOLTAGE to fuel injectors

[doorgunner]

Just wondering if anyone has had a similar problem with LOW voltage to the fuel injectors (I've replace a few things in the last couple years, but that's to be expected from an '89). I let the truck sit up for about 5 months--replaced the 4 yr. old battery. No codes showing! Great spark at plugs and 38 psi at fuel rail. You'd expect the spark plugs to be soaked with fuel after cranking it 5 times, but the plugs are DRY! I left the plugs out and disconnected the #1 cylinder injector wiring and connected a test light to the injector electric plug--when I crank the engine, the light pulses(blinks) on & off just like you'd expect the injector to open/close, same thing on the Other injector wires. If I temporarily connect 12 volts to each of the injectors one at a time--they tick each time voltage is applied to the injector terminals (I have a spare injector and tested it the same way on my work-bench--it ticked and the needle valve opened as long as I applied 12 volts to the injector! ) I"D RATHER GIVE TOO MUCH INFO THAN NOT ENOUGH. SO, I'm thinking something weird is going on with the voltage. I searched through the forums but found no info on injector/voltage problems. Anybody got an idea WHICH WIRE(S) would supply voltage to the injector harness, and which ELECTRIC COMPONENT(s) would possibly cause low voltage to the injectors???
I going to the truck now with some sandpaper and electronic spray to clean the CONNECTOR terminals and check for corroded wiring while you guys think about the problem. ANY SUGGESTIONS APPRECIATED--

 

[MAKG]

Check the resistance of each of the injectors. If it's low, it may very well look like low voltage.

But I don't see why you think the voltage is low. It's not hard to measure that....

Just to check, you didn't take your voltage reading across the injector, did you? If you did, you'll get an "average" voltage equivalent to battery voltage times the duty cycle.