Bravo 3 Digital v Analog trim sending units? WHY?

[William Miller]

2006 AJ290 350 mag mpi B3
I'm sorting out some issues after rebuilding my mains.
One is the Starboard Trim sender. Code 131 stbd trim ckt low on the system view.
I thought it could be the puck was clocked wrong. Could be that I have it wired wrong.

While doing some searching on line I saw lots of info on digital sending units.
My engine harness could be setup for both.

Can anyone explain the background and progression of the digital senders. I saw that it only is one puck with 3 wires. Mine is the traditional 2 puck with the port side wired to the trim pump to limit "UP" . Starboard puck is for trim indication. Since I have smartcraft I believe it feeds the engine ECM. At the connectors on the engine harness one was labeled analog. One was labeled digital. The third I think is ground.

The ecm 555 manual shows them but doesn't explain why there are two options.

I'm hoping someone can help explain these and how the digital trim system is different.


Thanks!

 

[paulswagelock]

Digital one is strictly used by engines equipped with DTS. The ecm limits the maximum up position under power, so they do not need the separate limit sender.

 

[William Miller]

Saw a thread somewhere about it being used on sea core.
What does "SEA CORE" B3 have that is different than std B3?

I just looked up my 555 wiring diagrams.
The analog orange/light blue wire goes straight thru the Round engine connector.
The digital Orange/White wire goes to pin B13 on the ECM.

So I'm guessing "digital label" doesn't mean digital sender it feeds analog signal to the email that feeds the digital smart craft system view.

Do you know if I didn't have system view is there a trim guage with a needle? It would be so much easier to work than switching the display on system view all the time

 

[paulswagelock]

Nothing to do with sea core. The DTS transom assembly is different than the rest, and uses the digital sender. Now, a sea core engine might also be DTS, so then it would have it.

 

[William Miller]

Thanks.
Ok. How is Sea Core different than a normal B3?