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bigblazer
bigblazer 3/21/2011
1987 Chevrolet Blazer Silverado 8Cyl5.7L - Engine
replaced motor hook up battery ecm fuse blows whats the cause
all electrical hooked up as it came out except for accessories lights etc front clip is off any ideas appreciated
6 Answers
  • Bill
    Bill 3/21/2011
    Clip off,, check for any shorts in that wiring
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    Bill
    bigblazer 3/21/2011
    wiring fine little hacked but fine
    Bill
    bigblazer 3/21/2011
    would not having ground hooked up for lights etc cause a power surge in the other wires
  • HouseCallAuto
    HouseCallAuto 3/21/2011
    Either the Engine Oil Pressure Sensor Wiring or the Fuel Pump Wiring is shorted to ground. I assume that you are referring to the ECM B fuse ?
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    HouseCallAuto
    bigblazer 3/21/2011
    yes might be oil pressure sensor wiring fuel pump on totally different circuit
  • HouseCallAuto
    HouseCallAuto 3/21/2011
    The circuits are NOT separate. Try this

    1. Disconnect the oil pressure switch.

    2. Jumper the Orange and Tan/White wires together, check for fuel pump operation.

    3. If the fuel pump does not run, check for 12v back at the fuel pump, Tan/White wire, while the jumper is still in place.

    Reply
    0
  • HouseCallAuto
    HouseCallAuto 3/21/2011

    1. Check wiring from fuse to fuel pump relay, oil pressure sending unit and to Powertrain Control Module (PCM).

    2. Check wiring from fuel pump relay and oil pressure sending unit on its way back to the fuel pump.
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  • bigblazer
    bigblazer 3/24/2011
    fuel pump on a toggle switch ran like that for six weeks without any trouble found brown or orange running with o2 sensor broken cant find where it runs too
    Reply
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  • david
    david 3/24/2011
    check for pinch wires between bellhousen
    Reply
    0
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