Originally Posted by
THEMCGUIRE
Bought a $5.00 test light
On B2 there should be a 2 second on with key on even if you don't go to crank, as soon as you turn to crank it should again have power.
I have power at B2 when turning on key that lasts for 2 seconds. On cranking I have power again.Check!
Then if there is a crank signal to C9 when key is cranked the fuel pump trigger at A1 turns relay back on and looks for the signal again at B2.
I have a light when cranking to C9Check!
Do you have power at Orange wire B1 and C16 Batt Power? Key off, key on, key Crank? Should be hot always.
Yes I have power to B1 and C16 under all 3 conditions.Check!
Do you have power at Pink wire A6 Ignition, should be hot key on and key crank? Should be hot key on and key crank.
I have power at A6 both conditions.
I have replaced the ignition switch.
Check!
Using Bypass wire on relay I have power at purple wire at fuel pump assembly. I then attached the test light to positive power and tested the ground wire at the fuel pump relay and at the bolt where the ground meets the frame. Test light lights up.
Again put 12 volt from battery to fuel pump. THis is a brand new fuel pump. No WIRRING. No Good! Bad Fuel Pump if you had power and ground hooked up? Could I have burned out the fuel pump with all this testing ? Doubt it, I ran one on the wall off my test bench for years till I put in a light bulb...
Can the fuel pump be tested OFF the truck ? Put in a bucket of water and apply 12v ? will water hurt the pump ? Why? It does not run?
Also went back and tested C3. It lights with key on but does not light during cranking. C3 is a typo from wiring disagram copy, it's an IAC wire, disregard.
btw - engine is connected via jumpers to a running car but rotation rate is now sluggish. So i sprayed 1 shot of starter fluid in and it started and ran until the started fluid was gone. Clean Batt terminals, charge batt, load test, should not need a jump start and still ne low power/slow crank. If something is drawing all this power there will not be enough left to turn on fuel pump relay!
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