Fuel pump no power
#1
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Baja 232 w a 502 mag mpi.
I am getting 1.4 volts to pump. It’s not turning on. When I turn the key I don’t hear the beep along with pump turning on. I just put 2 brand new harnesses in it this weekend. My pump relay has 12v and the grey wire only has 1.4 I would think it would be much higher. Pump turns on if I hook it straight to 12v. Also not sure what these wires are for. I didn’t have them on my old harness.
![](https://cimg9.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/7f043094_b194_4888_b973_4fd85e8abe64_b0c40fdb05e5426f4bd0fbdea6eb2bd851a06023.jpeg)
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I am getting 1.4 volts to pump. It’s not turning on. When I turn the key I don’t hear the beep along with pump turning on. I just put 2 brand new harnesses in it this weekend. My pump relay has 12v and the grey wire only has 1.4 I would think it would be much higher. Pump turns on if I hook it straight to 12v. Also not sure what these wires are for. I didn’t have them on my old harness.
![](https://cimg9.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/7f043094_b194_4888_b973_4fd85e8abe64_b0c40fdb05e5426f4bd0fbdea6eb2bd851a06023.jpeg)
![](https://cimg1.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/2000x1504/5cfd5694_badd_43b8_966a_1e1536f2fb92_4f31d40433c82ca627233b47378de16fea66adee.jpeg)
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#2
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Motor serial number?
#4
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is there a grey cap on a plug with 3 fuses inside one is for the fuel pump ? if this an OE wiring harness
#6
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1996 to 2001 goes across 2 manuals, not a lot of help
The single wire Blue/Tan (if it is tan) would be for transmission over temp (you don't have)
2 prong connectors
Unknown because unable to find anything in diagrams using those colors at rear of motor
Note fuses 15, 16 and 17
The fuel pump has a ground and Gray going to power up when relay energizes.
Ignition ON, supplies power to MPR. The MPR contact gets power from the engine circuit breaker thru a fuse and Red wire. The MPR is energized via the engine harness to EFI harness thru a pink wire
MPR supplies power to ECM and fuel pump relay contact. FPR is energized by the ECM thru the Green/White wire
Since your not getting a beep, then the beeper may not be connected and/or your not getting power to the ECM
![](https://cimg4.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/960x720/502_ec04d3d75caf9e9cfc7520312c96d32e0830b666.jpg)
The single wire Blue/Tan (if it is tan) would be for transmission over temp (you don't have)
2 prong connectors
Unknown because unable to find anything in diagrams using those colors at rear of motor
Note fuses 15, 16 and 17
The fuel pump has a ground and Gray going to power up when relay energizes.
Ignition ON, supplies power to MPR. The MPR contact gets power from the engine circuit breaker thru a fuse and Red wire. The MPR is energized via the engine harness to EFI harness thru a pink wire
MPR supplies power to ECM and fuel pump relay contact. FPR is energized by the ECM thru the Green/White wire
Since your not getting a beep, then the beeper may not be connected and/or your not getting power to the ECM
![](https://cimg4.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/960x720/502_ec04d3d75caf9e9cfc7520312c96d32e0830b666.jpg)
#7
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Wires are the same but would probably have all 3 fuses under one cap 13
![](https://cimg3.ibsrv.net/gimg/www.offshoreonly.com-vbulletin/960x720/mefi_3_mpi_39c473655eb018a50f37313fe5f596580f20d270.jpg)
#9
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Main Power Relay