Question about 1999 Chevrolet Silverado 1500

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I need a wiring diagram. I swapped out a 4.3 for a 98 5.7 vortec

I have a 99 silverado with a 4.3, manual trans. I bought a 98 5.7 that came out of a 98 Yukon. I'm having problems knowing what wires I need to keep and the ones I don't. I have the wiring harness from the 5.7 on the motor,and the 4.3 harness on the truck. I don't know what wires from the 5.7 harness I need through the firewall,since the plugs are different. Gauges,ignition wires, fuel gage. Some of the pins in the ECM are different color wires or that pin position does not even have a pin in it. It would be nice to have a diagram of the ECM also. can anyone help me please?

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  • Anonymous Mar 21, 2014

    need complete wiring harness for 3100 motor have mupital things going wrong

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Fluid specifications and quantities for 99 silverado


You did not give your engine size or other information, but here is a list from the handbook...

Cooling System Capacity (Approximate)
VORTEC
4300 V6
Automatic 12.6 quarts (11.9 L)
VORTEC
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Manual 12.9 quarts (12.2 L)
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VORTEC
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VORTEC
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Crankcase Capacity (Approximate)
VORTEC
4300 V6
W 4.5 quarts (4.3 L)
VORTEC
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Fuel Tank Capacity (Approximate)
Short Bed 26 gallons (98 L)
Long Bed 34 gallons (128 L)
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Wiring problems


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