Question about 1999 Chevrolet Silverado 1500

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99 silverado fuel pump

There are 4 wires going into the pump -gray-black-purple-orange with black strip- what wires should be hot and what wire should be ground

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GRAY IS FUEL PUMP, PURPLE IS FUEL GAUGE, BLACK IS GROUND,ORANGE WITH BLACK GOES TO COMPUTER.GREY WIRE WITH KEY ON WILL BE BATTERY VOLTS FOR TWO SECONDS UNLESS CRANKING ENGINE OVER.PURPLE WILL REMAIN ON WITH KEY LESS VOLTS THOUGH

Posted on Jan 30, 2009

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I just replaced the fuel pump on my 98 silverado z71 and the harness that came with the new pumps wiring is different. the old harness has four wires colored gray on b, purple and white on a, two black,...


I may not be of much help.
According to autozone online, 96-98 model trucks should have - -
gray from relay to the pump
black / white ground for pump
pink - black for gauge ground
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You should be able to jumper the pump relay and look for a hot for the pump. You should have two grounds, I doubt it makes much difference which you use for the pump. And then you should have a hot for the gauge with the key on and the relay disconnected.

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connect the wires as indicated below

1999 Chevrolet Silverado C1500 Wiring, aftermarket stereo wire colors

Car Radio Battery Constant 12v+ Wire: Orange, yellow
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Car Radio Illumination Wire: Gray (Tape off) not used
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please let me know if you have any more questions, and thanks for using FixYa.

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I need to know what each color means on the existing radio stereo wires please... 1999 chev silverado.


I think this is the right table, but I don't know if it will display right. If not, go to http://www.installdr.com/InstallDocs/GM/PDF/460005.pdf

Typical GM Factory Typical New Radio
Pin What It Is In Dash Wire Color Equivalent Wire Color
A Left Front Spkr (-) Light Gray White w/ Black Stripe
B Left Front Spkr (+) Tan White
C Right Front Spkr (-) Light Green Gray w/ Black Stripe
D Right Front Spkr (+) Dark Green Gray
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F Not Used
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H Power Antenna Turn On Pink Blue
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J +12 Volt Battery Wire Orange Yellow
K Right Rear Spkr (-) Light Blue Purple w/ Black Stripe
L Right Rear Spkr (+) Dark Blue Purple
M Left Rear Spkr (-) Yellow Green w/ Black Stripe
N Left Rear Spkr (+) Brown Green

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1 Answer

2001 gmc hd 2500 has 4 wires to fuel pump,,orange purple grey and black what is each for


Hello tsundw.
Gray(positive from relay) and black (ground) are for fuel pump.
Purple and Orange are for your fuel level gauge.
That is a diagram for the gasoline engine.
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i have built and repaired wire harness' for four winds rv for 5 yrs now and previously gm cars for 4 yrs

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