Mercury Repair Questions? Ask a Mechanic for Answers ASAP
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Your reverse light do not run through the LCM and if they are now out again with a new switch then I would start first with making sure the F2-16 fuse (15AMP) located in the interior fuse panel is okay and has power in and out of it and if that checks okay then take is back to your mechanic and have him recheck the new transmission range switch that he replaced to be sure you have power in and out of it to the reverse lamps.
Im not sure what that means because there is no rewiring required when they replace the LCM. That being said your reverse lamps are not ran through the LCM as well so start with checking the fuse I mentioned and if it checks okay the have the new switch checked.
No, your reverse lights are controlled by the power from the Fuse F2-16 out through the transmission range switch located on the driver side of the transmission. I am assuming that is the switch he replaced since that is the switch that controls your reverse lamps.
Yes it is , see the link below for its location. It mounts to the side of the transmission.https://dl.dropboxusercontent.com/u/104923897/TRS%20Aug%2020.pdf
If there working as designed then it dose make it almost impossible to diagnose so I would agree with him. At this point the best thing to do is wait till they fail again and then run the test steps to verify what has failed.
Your very welcome and thank you as well.