EFI Swap - Alternator Plug New to Old? Oil Pressure plug Fuel Pump plug?

[BFD305]

Alright guys, I am getting there. I got the vacuum side of the harness cleaned up, now working on the other side.

I was working with the alternater (from 89 EFI engine), which still had the wires attached. It has a big plug and a small 2 pole plug coming from it. I see no where to attach to the 89 harness, but it hooks fight into my original harness once I remove the old alternator plugs and voltage regulator. Will this work? The newer alternator won't need the external regulator will it?

If I am using my stock gauge cluster, from what I have read I use my original oil sensor and extension with the plug on the old harness, and use the plug and old harness on the temp. Is that correct?

Still a little confused on the fuel pump wiring. I know I can run new wires from the solenoid. But the harness must have a connector that ran to the original fuel pump that I can hook into. Any help on what it would look like? I figure that it would be cleaner to use what is there if I can.

Thanks again.

 

[ransil]

Alright guys, I am getting there. I got the vacuum side of the harness cleaned up, now working on the other side.

I was working with the alternater (from 89 EFI engine), which still had the wires attached. It has a big plug and a small 2 pole plug coming from it. I see no where to attach to the 89 harness, but it hooks fight into my original harness once I remove the old alternator plugs and voltage regulator. Will this work? The newer alternator won't need the external regulator will it?

alt is not part of the efi wiring, remove bronco external reg, to wire a 2G alt you need big wire to battery or battery side of solenoid, also connect the old bronco big yellow wire to it, connected this way will bypass the amp gauge or only connect it to bronco yellow to use amp gauge and a ign switched wire ( hot in run) get that from your old voltage regulator, green red I think

If I am using my stock gauge cluster, from what I have read I use my original oil sensor and extension with the plug on the old harness, and use the plug and old harness on the temp. Is that correct?

Correct, wither temp sender will work, Bronco or EFI motor they are the same

Still a little confused on the fuel pump wiring. I know I can run new wires from the solenoid. But the harness must have a connector that ran to the original fuel pump that I can hook into. Any help on what it would look like? I figure that it would be cleaner to use what is there if I can.

you need a relay to power the FP, main power for the relay comes from a fuse , to turn the relay on/off is the conputers job should be a wire for that, it will grouns the relay terminal to control it, there is also a FPm ( fuel pump monitor) wire on the computer this should be connected to the output of the relay or the out put of the inertia switch.

Thanks again.

see blue

 

[66fora69er]

Pink/ black should be the fuel pumps power.

 

[Steve83]

What's your donor vehicle?

The 2G alternator used in '89 is dangerous. You should really go with a 3G. The wiring is slightly easier, and it puts out more.

The FP wiring comes from the engine bay harness that goes to the EEC. There are 2 relays: the EEC PWR (brown connector) and the FP (green). Cut both off and upgrade to the newer Bosch/ISO relays shown here:



The FP output goes to the inertia switch in the dash harness and comes back out to the chassis harness. If the donor was a pickup, it passes thru the tank select switch in the dash after the inertia switch.

The Pk/Bk is part of the FP relay trigger circuit - not FP power.

 

[66fora69er]

I was going off memory, I stand corrected;D