Larson, 4.3 GL-J, SX-A electrical gremlins

Engident

Cadet
Joined
Jun 28, 2004
Messages
11
Hey guys
2008 Larson 180 Sport, 4.3 GL-J, SX-A outdrive. I am brand new to this boat, to the 4.3, and I/O in general. Brand new crate engine (long story, not my fault), new exhaust manifolds, new intake manifold, new Holley carb, outdrive input shaft seal replaced.
After the new motor was installed, these electrical gremlins appeared:
1) Trim gauge not working
2) Oil pressure gauge not working
3) Alarm (little red thing hanging under dash) going off continuously with ignition on, even after engine started.

I suspect 2 and 3 are related. Is this most likely the oil pressure sender? Is there more than one? Where is it located and how do I check it?

for trim gauge-- sensor looks aftermarket and new-ish, so may have been replaced shortly before I got the boat but was not replaced during the work I had done. I found what I think is the plug over the back of the motor-- 3 wires coming thru transom, 2 wires on end toward dash, it is firmly connected. Should I just go ahead and replace the trim sender, or is there more sophisticated testing I could do here to narrow down the issue?
Thanks guys
David
 
Last edited:

alldodge

Moderator
Staff member
Joined
Mar 8, 2009
Messages
43,818
I would look closer at the 10 pin harness connector. Numbers 2 and 3 are dealing with 2 different wires going thru the connector. The trim gauge has it's own separate wire and is powered by the purple wire at the helm
 
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