Hi All; New member here from Colorado. Thanks for all of the good reading over the years!
Currently own/working these trucks: '11 4runner, '86 4x4 EFI pickup, and an '86 2wd 22r pickup.
I'm hoping someone can help me with some wiring issues I'm working through on my '86 EFI. I picked this truck up not too long ago and it has a whole slew of funky wiring mods/issues. I'm slowly trying to revert things back to factory wiring and I'll just say that I'm better at rebuilding a carb than tracing electrical problems. I'm learning, but still fairy novice on electrical. Basically, I'm a hobbyist, not a professional. With that in mind....
(1) My biggest issue and main reason I'm seeking help: constant power to fuel pump when the battery is connected. One of the previous owners had the fuel pump wired through an on-off switch, I assume because they couldn't find a short or something, but the switch was left on and pump failed. Due to pump being dead (I bought this as a non-running truck), I've replaced the tank, fuel pump, filter, float, etc. It now fires right up and runs nicely (yay). But that's not my issue. I bypassed that on/off switch as a step one to find out what's up with the constant power issue. The bypassing of the switch only made it so that 100% of the time the pump has power and currently no ability to turn it off minus disconnecting the battery (no surprise). The power wire that come from fuel pump, goes to some wiring that's right by the cab fuse box (see picture--looks like factory wiring to me). That connector that has 2 wires: blk/wht--wht/blk and you can see in the pic that the non-factory wire (red) is spliced with the blk/white wire. I cannot find what these wires are in the FSM wiring diagram. Could be maybe something that was intended for a light or something? I'm thinking that finding out what those wires are (pictured) will lead to my next step. Should I cut the jumper, non-factory, wire out and then try to troubleshoot?
I've checked out the circuit opening relay and main EFI relay. Those seem to be good.
A couple other note-worthy points (in case these could be related to my pump issue):
-Horn/hazard light fuse burns immediately when battery connected.
-No other fuses get burnt immediately with power.
-The wires that go to the back of the "flasher" relay were cut off. Luckily the cut wires and connector were left in the glove box. I think this is likely culprit for causing fuse to burn.
-No parking brake switch is in place.
Well, hoping for some ideas so I can progress in my trouble-shooting. I've attached a photo to show what I'm looking at. I'd be much appreciate of any/all advice!
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Currently own/working these trucks: '11 4runner, '86 4x4 EFI pickup, and an '86 2wd 22r pickup.
I'm hoping someone can help me with some wiring issues I'm working through on my '86 EFI. I picked this truck up not too long ago and it has a whole slew of funky wiring mods/issues. I'm slowly trying to revert things back to factory wiring and I'll just say that I'm better at rebuilding a carb than tracing electrical problems. I'm learning, but still fairy novice on electrical. Basically, I'm a hobbyist, not a professional. With that in mind....
(1) My biggest issue and main reason I'm seeking help: constant power to fuel pump when the battery is connected. One of the previous owners had the fuel pump wired through an on-off switch, I assume because they couldn't find a short or something, but the switch was left on and pump failed. Due to pump being dead (I bought this as a non-running truck), I've replaced the tank, fuel pump, filter, float, etc. It now fires right up and runs nicely (yay). But that's not my issue. I bypassed that on/off switch as a step one to find out what's up with the constant power issue. The bypassing of the switch only made it so that 100% of the time the pump has power and currently no ability to turn it off minus disconnecting the battery (no surprise). The power wire that come from fuel pump, goes to some wiring that's right by the cab fuse box (see picture--looks like factory wiring to me). That connector that has 2 wires: blk/wht--wht/blk and you can see in the pic that the non-factory wire (red) is spliced with the blk/white wire. I cannot find what these wires are in the FSM wiring diagram. Could be maybe something that was intended for a light or something? I'm thinking that finding out what those wires are (pictured) will lead to my next step. Should I cut the jumper, non-factory, wire out and then try to troubleshoot?
I've checked out the circuit opening relay and main EFI relay. Those seem to be good.
A couple other note-worthy points (in case these could be related to my pump issue):
-Horn/hazard light fuse burns immediately when battery connected.
-No other fuses get burnt immediately with power.
-The wires that go to the back of the "flasher" relay were cut off. Luckily the cut wires and connector were left in the glove box. I think this is likely culprit for causing fuse to burn.
-No parking brake switch is in place.
Well, hoping for some ideas so I can progress in my trouble-shooting. I've attached a photo to show what I'm looking at. I'd be much appreciate of any/all advice!
