Weird Trim/Trailer Issue

R

Rick_D

Member
Joined
Jul 10, 2022
RO Number
34740
Messages
17
On my 1997 Larson Cabrio 310 I had an issue where trimming up my port drive would also trim up the starboard drive...almost as if I was using the trailer switch to trim up the drives at the same time. Anyone have insight as to what could be feeding both drives when only 1 is being activated? Trim switches are new as are the selonoids.
 
Not familiar with whatever stern drive you have but if the switches and sols are new, i d start with the wiring. Did they work correctly after being replaced ?
 
If you trim up the stbd does the port go up as well and does the trailer switch bring both drives up or are there two trailer switches? If you trailer the drives does one stop earlier than the other?
 
Trailer switch is disconnected as I thought somehow that was playing a role but it is not. The issue is that one of the selonoids has a jumper wire that runs to the other pump. When actuating that pump it back feeds the other one. Nothings changed on the wiring but it wasn't always doing this. That jumper wire is supposed to provide the feed when the trailer switch is activated but not when the drive switch is activated. So somehow that jumper is supposed to "know" to only back feed when it's being fed by the trailer switch. Will examine the wiring a bit more for a diode or relay that's not behaving properly.
 
Interesting. Never knew they got tricky like that. Looking around a bit is there a control module for the drive trim? Given this schematic I am thinking you might have one of these control modules and it needs to be replaced. I believe that inserting a diode into the jumper wire will only prevent both drives from responding to one of the trim switch inputs. It would take two diodes but they would be on different wires, not a single jumper.
It sounds like a cheap way to bypass a bad controller and trailer the drives? I'd remove the jumper and see how things behave.

Mercruiser sterndrive power trim and tilt diode module for duel engines wire harness

Have a bad diode in my diode module for my engine trim and tilt system wiring harness Can anyone give me a hand to locate either the correct diode or a new or working old diode module. Thanks Gary ghoskins38@gmail.com
www.marineengine.com
 
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Excellent find on the diagram! I don't ever remember seeing a control module so I will have to look again to see where it resides. Given all wiring routes through it, it shouldn't be hard to find. Will let you know what I find.
 
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