4.3 wiring questions - reinstalling engine

ShoalSurvivor

Petty Officer 1st Class
Joined
Aug 1, 2012
Messages
290
Hello, I reinstalled my transom assembly and am reinstalling the engine after replacing crankshaft seals. In the process, I replaced the trim sender and limit switches.

this is for a 2004 4.3 with 4bbl carb and alpha one gen 2 drive.

couple of questions:

1) I found a disconnected ground wire with eyelet that looks unused, coming from the wire harness near the slave solenoid and ignition fuse. Should that be attached to something?

IMG_4838.jpeg

2) found a simolar ground with eyelet coming out of harness at same location as purple/white and black wires connecting to the carburetor. I don't think this was ever connected to anything, but wanted to verify.

IMG_4839.jpeg

3) i connected the trim sender (m/f quick connects), but do not recall where the trim limit wires were connected. both sets of wires were severed in the bell housing. the quage did not work and the limit switch may have bypassed or wasn’t connected. I cannot find any obvious available connectors near the pump.
my commander has U/D and trailer buttons with red/green/blue/purple wires coming to pump, and there’s an aft U/D switch as well.
the purple is connected to the blue near the pump. Does the limit switch connect inline to the blue/purple connection? Is it possible that it was never connected or used?

IMG_4828.jpeg
thank you!
 

Fun Times

Moderator
Staff member
Joined
May 16, 2009
Messages
9,298
The first black wire photo may have been for mercruiser mercathode system had your engine utilized the corrosion protection from new or installed later as it's an option on some models and standard on others.

But also, be sure you have a bonding wire between the engine ground stud and the transom housing assembly like shown in the following and that wire is or isn't part of the bonding system,

The second wire would be for the carburetor choke as they usually had a few designs over the years and offered both ground wire connection terminal types for easier connections.

Looks like you already found the same video as I was typing this up but again, to help get a better visual of the where a general location may be at for the trim limit and gauge wires, see right around the 6:00+ minute mark as the video shows them pretty well,

Plus, the 3:00 minute mark here,
 

ShoalSurvivor

Petty Officer 1st Class
Joined
Aug 1, 2012
Messages
290
thank you!
block to transom bracket ground in place.
i have the sacrificial anode (not electrical mercathode) and I replace those as needed.
 
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