MerCruiser MCM 165 Trim Sender Wire

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brianadmans

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Hi Folks. I am hoping there are still some expert OLD MerCruiser experts out there with good memories!. I have a very old (79-81) MerCruiser MCM 165 - serial number 5653967 with what I believe is an MC-1 outdrive. I cannot seem to figure out which wire is the trim gauge sender wire (did this era even have a trim gauge?). Can one you please help. Thank you
 
alldodge

alldodge

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Welcome
When the trim sender first started it uses a Brown/White wire, and still does today
 
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brianadmans

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alldodge said:
Welcome
When the trim sender first started it uses a Brown/White wire, and still does today
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Thank you for this. I did have the correct wire it seems but I will have to figure out where it goes and why it is not producing the trim gauge results that I was hoping for
 
alldodge

alldodge

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The wire goes to the starboard side gimbal ring trim sender.

Look for the 4 black wires coming inside the boat from the top of the transom assembly. Two go to trim limit and the other two are go the sender. The black wires connect to other wires with bullet connectors
 
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brianadmans

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Please be patient with me!! On this boat (Mercruiser (serial number 5653967) with what I believe is a MC-1 outdrive. This outdrive does not have the 2 "pucks" that are normal. I am really not sure where the trim gauge sensor is or how it works but I might trace the brown/white wire back to see where it goes. anything you can share I would be very appreciative
 
alldodge

alldodge

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All good, will try and explain until you understand

Your drive does not have the senders mounted which means your drive does not have the capability for the trim gauge.

Even if you have a brown/white wire at the helm, the option for it can not be added without replacing the transom assembly and the drive.
 
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kenny nunez

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Where the trim/limitwires come through the transom they are retained with 2 1/4”20 bolts which are almost impossible to unscrew without breaking off.
Also are very hard to even get to even with good tools. Just about every time I have tried to get to them one of them will break off. The only way they can be gotten to easy is with the gimbal ring removed.
The only other way is to re route the wires outside of the gimbal housing by drilling holes for the wires and running them through a hole in the transom.
 
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