Trim pump help, please! - Pensacola Fishing Forum

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Old 06-06-2012, 07:13 PM   #1
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Default Trim pump help, please!

I'm feeling like something is whacky, I'm not sure what?

I just put a new 12v Trim Pump motor AND 2 new Trim Pump Relays on.

Whatever is supposed to reverse the polarity seems like its not working?

If I hook up all the wires as it should be; ie Trim sending unit, Trim limit switch and the Power connector for the Trim Pump motor, the Tilt/Trim seems to only work intermittently?

If I unhook the Trim sending unit & The Trim limit switch, the Tilt/Trim works fine BUT, both switches (Up Switch & Down Switch) make the motor go DOWN.

If I switch the polarity on the Trim Pump Motor connector, both switches (Up Switch & Down Switch) will only make the motor go UP.

If I disconnect the hood tilt/trim switch I still have the same result with the binnacle switches, ie both switches only move the motor UP or DOWN (DEPENDING ON HOW I HOOK UP THE POWER WIRES FOR THE TRIM PUMP MOTOR).

I'm wondering if somehow the Trim Sending Unit or, Trim Limit switch affect the ability of the Tilt/Trim system to reverse polarity?

I've checked ground wires and power wires, cleaned them etc. I'm stumped??
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Old 06-06-2012, 07:17 PM   #2
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It's a 1992 Johnson 225hp PLENR...
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Old 06-07-2012, 07:57 AM   #3
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Are you sure the hyd. hoses are not backwards? I would google the schematics for the wiring. I'm not very familiar with OMC pumps.
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Old 06-07-2012, 09:08 AM   #4
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we figured it out.........I'm posting my results to possibly help anyone else that has this problem.

The main problem was in the binnacle trim switch. I never expected that because the binnacle is only 3-4 years old?

The binnacle switch circuit had a short that was backfeeding the panel to the tilt/trim relays.
Every time you hit DOWN or UP (on the cowl switch or binnacle) the motor would move up/down for a second then immediately stop working.

We saw with a test light that the UP AND DOWN circuits were getting voltage at the SAME time when you used the cowl switch.
For example, if you hit the UP/Blue wire you would see voltage on the relay socket for Blue AND see voltage on the DOWN/Green wire circuit!
We disconnected the binnacle trim switch and the problem of getting voltage across both UP & DOWN trigger wires at the same time went away.

I suppose the short in the binnacle trim switch is what killed my trim pump motor in the first place?
The tilt/trim never got possessed and moved on its own but, apparently for some time it had been sending voltage to move the trim pump motor up & down at the same time until the trim motor gave out?
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