1994 sl750 trim motor won't run from switch

[polarisman]

I have 1994 polaris sl750 and the trim motor will not work from the trim button. If I put 12vdc on the motor it will turn in both directions. I thought i had a bad trim switch but I replaced it.
It seems to have something to do with the MFD. The MFD on that year are terrible I keep having them go bad. When the MFD goes bad I disconnect it and replace the fuse but the trim will not work.
What should I check?

[Technical Support]

Re: 1994 sl750 trim motor won't run from switch

I think the trim only works if the engine is running.

[polarisman]

Re: 1994 sl750 trim motor won't run from switch

The trim will not work if the multi function display is not connected.
The MFD on the 1994 sl750 are terrible I have replaced the unit 3 times in two years. When the MFD goes bad it blows the fuse. So I disconnect the mfd and now the trim doesn't work.
How can I keep the MFD from going bad?

[Technical Support]

Re: 1994 sl750 trim motor won't run from switch

I always kept my 94 covered up and never let it set in the sun too long when it wasn't getting used. I don’t know for a fact if the gauge being exposed to the sun all the time has anything to do with it but I guess its possible.