Spyder fuel pump wires +/-

[MindBlowin03]

Looking to find out which wire is which on my '98 Spyder. Im doing the rewire but Im stuck. Everything I read tells me the black wire is ground but my Spyder has a black/blue and a black/white. I tried searching but couldnt come up with any answers.

 

[luv2rallye]

Well it depends on which end of the car you're at, and if up front, whether you're rewiring the existent relay or adding another relay. Sounds like you may be under the dash where the stock FP relay is? On that relay the large black-white (14 guage) is power from the ignition switch, the black-blue (16 gauge) goes to the FP, and the white-red control wire goes to the ECU.
If up front, are you just rewiring the stock relay or adding another of your own? Or are you back at the FP adding a relay?

 

[MindBlowin03]

Im in the back, at the housing. I unplugged the wires and cut them, but I dont know which is positive and which is ground. I can take a picture if I need to.

On a side note... I also have some other weird sensor thing on the top of my housing that Ive never seen before on a 2G. Not sure if that means anything or not.

 

[luv2rallye]

Is this the 2.4 or the 2.0 turbo or 2.0 NT?
And auto or manual?

 

[MindBlowin03]

Im sorry, its a 1998 Spyder 2.0L turbo 5spd.

 

[luv2rallye]

Well it should be the same as the 2g turbo non-spider then. Your black/white may be a faded black/yellow. You can always test the wires for voltage or ground continuity.
But for the 2g turbo rewire with new FP relay in back:

Relay pins:
30 - new heavy gauge wire you added from battery positive (thru 20A a fuse)
87A - not used
87 - when cut black/blue wire this is one that goes to pump
86 - when cut black/blue wire this is one that comes from the front of car (actually is from stock FP relay).
85 - splice into larger black wire (on FP connector pin 1) which goes to ground. You shouldn't have cut the big black wire. It still must go to the FP thru pin 1 as it's the FP ground. But now that it's cut just connect the 2 halves back together with a wire that goes to pin 85 (or connect both halves right on pin 85).
Solder everything and wrap tape or heat shrink tubing around each connection.

Connector pin 3 has a yellow/black which is the fuel low light and connector pin 5 is also a yellow/black which is the fuel gauge. The small black on pin 6 is the ground for these two and must not be used for the FP ground as it is too small. Use larger pin 1 black for FP ground.

As for the other weird sensor post a picture.

 

[MindBlowin03]

Ok, thank you. I did notice that on some rewire FAQs it says to leave the harness ground alone and just ground the relay. http://www.dsmtuners.com/forums/art...s-t-fwd-gsx-awd-fuel-pump-rewire-diagram.html Wouldnt it be better to ground the relay on a 10awg chassis rather than the harness ground?

I will take a pic later of that connector/sensor and post a pic.

 

[luv2rallye]

Yes, that's even better. (Either way works - I just thought if you had already cut the harness ground wire, you may as well just tap into it since you have to reconnect it anyway.)

 

[MindBlowin03]

Here are a couple quick pics of the sensor I was talking about.

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[luv2rallye]

If there's 3 wires on it, black, green-yellow, blue-white, it appears to be the fuel tank differential pressure sensor.

 

[19Eclipse90]

http://www.dsmtuners.com/forums/electrical-tech/459418-connector-wire-identification.html#post153222037