Looking for 496 MAG/HO Electrical Harness
11-20-2011, 09:38 AM
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Looking for 496 MAG/HO Electrical Harness
Anyone has one for sale?
I'm converting a DTS motor to a Mechanical one and it looks like I need to replace the complete harness as well.
I'm converting a DTS motor to a Mechanical one and it looks like I need to replace the complete harness as well.
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11-20-2011, 12:27 PM
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I'm also converting to HO so I already have a non DTS ECU.
I also have a HO cam and a mech throttle body.
11-21-2011, 09:58 PM
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Yes Tomas, the Merc 496 DTS engine uses a different ECM and harness than that used on the manual throttle models.
The DTS ECM can be re-tuned and unless you have to loose the DTS, you can do engine upgrades and stay with the DTS.
What are you trying or planning to do that is making the elimination of the DTS throttle a must?
Best Regards,
Ray @ Raylar
The DTS ECM can be re-tuned and unless you have to loose the DTS, you can do engine upgrades and stay with the DTS.
What are you trying or planning to do that is making the elimination of the DTS throttle a must?
Best Regards,
Ray @ Raylar
11-21-2011, 11:09 PM
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Yes Tomas, the Merc 496 DTS engine uses a different ECM and harness than that used on the manual throttle models.
The DTS ECM can be re-tuned and unless you have to loose the DTS, you can do engine upgrades and stay with the DTS.
What are you trying or planning to do that is making the elimination of the DTS throttle a must?
Best Regards,
Ray @ Raylar
The DTS ECM can be re-tuned and unless you have to loose the DTS, you can do engine upgrades and stay with the DTS.
What are you trying or planning to do that is making the elimination of the DTS throttle a must?
Best Regards,
Ray @ Raylar
I'm converting to a mechanical system since I just bought the engine and don't want to use the DTS.
I'm still waiting to get the engine but want to have all the parts I need when I get it.
I already have a mech HO ECM, cam and a mechanical throttle body, so I also need to replace the harness?
What's the reason for replacing the harness?
11-22-2011, 08:58 AM
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Tomas:
The reason for either extensively modifying the existing DTS harness or using a complete mechanical throttle harness is because on the DTS engine there is not a seperate TPS, throttle position sensor, or IAC idle air controller like there is on the manual throttle engine. These two items are used on the manual throttle engine to control the ECM and the engines idle. On the DTS wire harness these wires are not there to connect these necessary sensors and controller and the throttle position sensor and the idle control are handled by a seperate group of wires feeding from the DTS ECM to the DTS throttle body. One could take the factory wiring diagram, add these wires or convert the DTS wires to the manual configuration and relocate any wires at the pin connectors at the ecm and with a manual throttle body ECM pin out schematic relocate the necessary pins.
Hope this explanation helps You understand the differences in the two systems.
Best Regards,
Ray @ Raylar
The reason for either extensively modifying the existing DTS harness or using a complete mechanical throttle harness is because on the DTS engine there is not a seperate TPS, throttle position sensor, or IAC idle air controller like there is on the manual throttle engine. These two items are used on the manual throttle engine to control the ECM and the engines idle. On the DTS wire harness these wires are not there to connect these necessary sensors and controller and the throttle position sensor and the idle control are handled by a seperate group of wires feeding from the DTS ECM to the DTS throttle body. One could take the factory wiring diagram, add these wires or convert the DTS wires to the manual configuration and relocate any wires at the pin connectors at the ecm and with a manual throttle body ECM pin out schematic relocate the necessary pins.
Hope this explanation helps You understand the differences in the two systems.
Best Regards,
Ray @ Raylar
11-22-2011, 09:15 AM
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Tomas:
The reason for either extensively modifying the existing DTS harness or using a complete mechanical throttle harness is because on the DTS engine there is not a seperate TPS, throttle position sensor, or IAC idle air controller like there is on the manual throttle engine. These two items are used on the manual throttle engine to control the ECM and the engines idle. On the DTS wire harness these wires are not there to connect these necessary sensors and controller and the throttle position sensor and the idle control are handled by a seperate group of wires feeding from the DTS ECM to the DTS throttle body. One could take the factory wiring diagram, add these wires or convert the DTS wires to the manual configuration and relocate any wires at the pin connectors at the ecm and with a manual throttle body ECM pin out schematic relocate the necessary pins.
Hope this explanation helps You understand the differences in the two systems.
Best Regards,
Ray @ Raylar
The reason for either extensively modifying the existing DTS harness or using a complete mechanical throttle harness is because on the DTS engine there is not a seperate TPS, throttle position sensor, or IAC idle air controller like there is on the manual throttle engine. These two items are used on the manual throttle engine to control the ECM and the engines idle. On the DTS wire harness these wires are not there to connect these necessary sensors and controller and the throttle position sensor and the idle control are handled by a seperate group of wires feeding from the DTS ECM to the DTS throttle body. One could take the factory wiring diagram, add these wires or convert the DTS wires to the manual configuration and relocate any wires at the pin connectors at the ecm and with a manual throttle body ECM pin out schematic relocate the necessary pins.
Hope this explanation helps You understand the differences in the two systems.
Best Regards,
Ray @ Raylar
I was also told there are different connectors on different year ECM's and of course also different connectors on the harness - is this correct and do you know what years are compatible?
11-22-2011, 09:33 PM
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Changes in the harness make it tricky!
There are slightly different pin positions and wire color/code changes on the three ECM connectors and harnesses, but those three connectors are the same on all PCM555's used on the Mercruiser 496 engines. There are also three distinct versions of the manual throttlebody -non-DTS harnesses based on year model of the engine, one is early with ten pin main connector only, one has both 10 pin and 14 pin main connectors and one has only a 14 pin connector. There are also slight differences based on were the water pressure sensor is located and which year cam position sensor the engine has. I checked and we have a 496 manual throttlebody harness, so I PM'd you with that info if you are interested.
Best Regards,
Ray @ Raylar
Best Regards,
Ray @ Raylar
