LS1 plastic tank in 1984 TA - wiring question
Thread Starter
Joined: Jul 2006
Posts: 1,287
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From: Rochester NY
Car: 1984 TA (1 stock / 1 custom)
Engine: LG4 / turbo LQ4
Transmission: 700R4 / 4L80E
Axle/Gears: Stock / 3:50 Moser 9"
LS1 plastic tank in 1984 TA - wiring question
i'm installing a LS1 plastic tank in my 1984 Trans Am and have a question on the wiring. i purchased a Squash Performance dual pump setup and hotwire kit. the products are great, but there was no installation instructions for the hotwire kit. there is a 6 pin connector on top of the sender. the stock wiring in my 1984 TA had a pink and black wire going to the factory tank. i assume the pink wire is for the fuel gauge and black is just a ground. i had Squash put a 0-90 ohm sender in the setup so i could use the stock gauge. any idea which wire on the LS1 6 pin connector i should tap into for the fuel gauge wire?
i tried searching, but most of what i found was related late 80s f-bodies that already had fuel injection and a three wire connection on the factory tank.
also, what is the connector on the right in the picture below go to?
i tried searching, but most of what i found was related late 80s f-bodies that already had fuel injection and a three wire connection on the factory tank.
also, what is the connector on the right in the picture below go to?
Senior Member
Joined: Jul 2006
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Re: LS1 plastic tank in 1984 TA - wiring question
Pin B is fuel pump 12v, splice this direct from the 3rd gen harness gry to gry
Pins C blk and D blk/wht are grds for the pump and sender respectively. Splice these to the 3rd gen grd wire blk
Pin A ppl is fuel level sender signal. Splice this to the last wire on the 3rd gen pigtail ppl to ppl
One of the purple wires (the ground) from the level sender in the tank, changes color from purple to blk/wht when it exits the top of the sender. I think thats where you two are confusing each other.
88Formula, I still recomend going to the Grand Prix sender and leaving the resistors alone.
Pins C blk and D blk/wht are grds for the pump and sender respectively. Splice these to the 3rd gen grd wire blk
Pin A ppl is fuel level sender signal. Splice this to the last wire on the 3rd gen pigtail ppl to ppl
One of the purple wires (the ground) from the level sender in the tank, changes color from purple to blk/wht when it exits the top of the sender. I think thats where you two are confusing each other.
88Formula, I still recomend going to the Grand Prix sender and leaving the resistors alone.
I found that from this thread:
https://www.thirdgen.org/forums/ltx-...w-3rd-gen.html
Joined: Mar 2001
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Car: '89 Firebird
Engine: 7.0L
Transmission: T56
Re: LS1 plastic tank in 1984 TA - wiring question
The vehicle side of the 4th gen sub-harness is meant to plug in to the body connector of a 4th gen car and has more connections than you need. You have to build out some wiring to adapt it to your car. Either get a mating connector and plug it in (with a few holes blank for the wires you don't use), or cut the connector off and redo with a connector of your choice. Simply put, if you examine the Racetronix harness there is a pump B+ (10 gauge red wire), pump ground (14 gauge black wire), and two small wires for the fuel sender. The end game is to wire that into your car.
Here is a wiring diagram I made for myself to understand the Racetronix Hot Wire kit,
https://www.thirdgen.org/forums/ltx-...ml#post5151055
Also, the Racetronix harness has more wiring than you need so you could clean up the wiring a bit, if you are so inclined. I didn't even use the 4th gen tank sub-harness. I ran the Racetronix wiring directly to the fuel pump. The following two links explain,
https://www.thirdgen.org/forums/ltx-...ml#post5893401
https://www.thirdgen.org/forums/ltx-...ml#post5893412
Here is a wiring diagram I made for myself to understand the Racetronix Hot Wire kit,
https://www.thirdgen.org/forums/ltx-...ml#post5151055
Also, the Racetronix harness has more wiring than you need so you could clean up the wiring a bit, if you are so inclined. I didn't even use the 4th gen tank sub-harness. I ran the Racetronix wiring directly to the fuel pump. The following two links explain,
https://www.thirdgen.org/forums/ltx-...ml#post5893401
https://www.thirdgen.org/forums/ltx-...ml#post5893412
Last edited by QwkTrip; Jul 22, 2017 at 11:37 PM.