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Quote from: rich weyand on June 16, 2013, 11:38:35 PM"Thanks Which wires are the oil pressure water temp and carb solenoid ??"These are: http://i816.photobucket.com/albums/zz90/fordkilaz/108.jpgAnd they are shown on the middle right side of this diagram: http://www.73-87chevytrucks.com/techinfo/wiring_diagrams/81-87_V8_engine.jpg Ok I will and whick one the booster one or the upper one by the heater box???
"Thanks Which wires are the oil pressure water temp and carb solenoid ??"These are: http://i816.photobucket.com/albums/zz90/fordkilaz/108.jpgAnd they are shown on the middle right side of this diagram: http://www.73-87chevytrucks.com/techinfo/wiring_diagrams/81-87_V8_engine.jpg
I already told you what they are....
Tieing into the clutch wire with a relay should work. You can use a two-circuit relay off the temp sensor to run the two fans, one on each circuit of the relay, then a relay on the A/C clutch wire connected to one of those circuits to bring one fan on with the A/C. This way the temp sensor can bring on both fans, but they are isolated from each other (not just wired in parallel) so that the A/C clutch connection only brings on one of them. That is, on one fan, you just have one side of the temp sensor relay, and connected to the other fan you have both the other side of the temp sensor relay plus the A/C clutch relay. If either one or both of those are on, that fan will run.
OK sorry. Its a little black vacuum line that comes right out of the fire wall. no wires going to it just a line. OK so here is the ? what feeds the heater and ac controls with vacuum???
Quote from: fordkilaz on June 19, 2013, 03:33:39 PMOK sorry. Its a little black vacuum line that comes right out of the fire wall. no wires going to it just a line. OK so here is the ? what feeds the heater and ac controls with vacuum???Vacuum is plumbed from the intake manifold, via a 7/32" hose, to a ~6" round, black plastic reservoir that mounts to the driver side firewall. The reservoir contains an integral check valve that keeps reservoir vacuum from bleeding off when the engine is accelerated hard or shut down. The vacuum line from the A/C control plumbs directly into this reservoir.