***if you are planning on repairing MFD READ THIS***

[NB2]

Great thread, so much good information.

[stimpsonjcat]

Quality post Sage18, thanks!

[Sage18]

This info was spot on for the repairs to my MFD here is a tip to see how deep you cut and I used a fine tooth Japanese flush cut saw to do the job. I used a work light up against the clear face to see exactly when I cut through the black plastic. I slowly cut till I reached the thin ribbon area and then used a flat head screw driver to break the last 3/4 inch or so.

[waterpest]

Thx K447....so I guess seeing that I do have this spare round MFD, I could install that in the same location where it exists on the SLT750, extend the wiring harness and the speedometer tube to suit, fabricate a blanking plate for the original MFD location on the crash pad, and call it a day. Has anyone seen this accomplished before?

[K447]

I do not have and have never seen proper schematic diagrams for the MFD circuit boards. A few people have managed to trace out MFD circuit fragments, but nothing anywhere close to component complete.

Those of us who have attempted component level repair on the oval MFD have had a few successes and many dead ends.

I suppose someone could identify those particular hot components and test them, or just replace with new components. Whether that would make any difference to the overall MFD health, I could not say.

[waterpest]

8-pin Oval MFD and the round MFD have the same wire connections on the 8-pin connector. They are interchangeable from a wiring perspective.

The fuel level calibration may be less accurate when swapping MFD, and the speedometer reading may also vary more from actual. Otherwise the Polaris 8-pin MFD are all plug and play.

So the OVAL MFD is mostly dead, I have tried plugging it in a half-dozen times or more, once it came to life had a nice crisp display, indicated correct fuel and oil levels, then went blank... I noticed while handling the circuit board under power that looking from the back of the circuit board at the top left corner of the oval, just beside and above the SET switch connector, the two devices that are rectangular black both were very very hot to the touch...I feel as if the MFD is almost salvageable like there is some voltage tracking across some semiconductor somewhere, but I have cleaned the board with electrical contact cleaner and a toothbrush three times.... any advice from the guru's? And a big thank you to those who have contributed to my troubleshooting thus far

[K447]

8-pin Oval MFD and the round MFD have the same wire connections on the 8-pin connector. They are interchangeable from a wiring perspective.

The fuel level calibration may be less accurate when swapping MFD, and the speedometer reading may also vary more from actual. Otherwise the Polaris 8-pin MFD are all plug and play.

[waterpest]

So I have this E box with the wiring harness from a 95 SLT 750, as you can see here I powered the box and set the oil level sensor to just above halfway and fuel sensor to full as indicated by the round MFD. All functions work. Question: Can I plug in the OVAL MFD from my 96 SLT 780?...Should it work with this wiring?..I am trying to determine if this Oval MFD is pooched

[waterpest]

There WAS moisture, it was wet after the ski flipped. I disassembled the MFD, dried everything, cleaned the circuit board, rubber connector, bezel, and let it all dry in the sun for more than an hour...there was zero moisture left anywhere when I reassembled it. The display is dark with great contrast and complete now...no missing digits, it's just not accurate

[waterpest]

Yes I unplugged to read voltage at the connector. I confirmed that voltage at the yellow stator wire in the connector...12.45v.
I will check the integrity of the circuits feeding the connector and the needle trick. The ski is at the lake, when I get back up there I will continue troubleshooting. Thx

[K447]

Are there any signs of moisture inside the MFD? Like condensation behind the plastic screen?

[K447]

Did you unplug the connector in order to 'confirm' the voltage? If yes, you may be changing the result.

Check the MFD supply voltage again while leaving the connector inserted fully into the mfd. slide a couple of straight sewing pins along the wires into the backside of the connector until they make contact with the metal pins inside. Then measure the voltage.

Also inspect the MFD pins for accumulated dirt, old dielectric grease, or corrosion. Use electrical contact cleaner to clean the MFD pins and spray cleaner into the mating connector socket holes. You can directly inspect the connector insides by removing the plastic retainer that snaps into the middle of the connector.

Only when the MFD is receiving a stable feed of battery voltage can it work properly. Any electrical resistance/corrosion/bad fuse/whatever in the power and ground wires or connectors can cause all sorts of weird behaviors.

[waterpest]

http://polarispwcknowledge.shorturl....t-things-to-do

Find the MFD section (search box in top right corner of web site), then search for the MFD calibration info and links.

Note: You will need to provide a 14.0 volt DC power source to ensure the recalibrated MFD can provide accurate voltage readings.

Just removing battery power from the MFD does not recalibrate the MFD voltage readings.


Inaccurate FUEL level may be caused by a defective (no longer buoyant) float inside the fuel sender unit. Replacement floats are available.

Inaccurate OIL level readings could have several causes, depends on the type of oil tank and sender.

Thx for steering me to the info. I wish I had a loaner oval MFD to verify all that is going on. The MFD was working fine until it got very wet. Oil/Fuel/Power etc were all indicating what they should have until it got wet. Even when the MFD is reconnected to the wiring harness the Fuel?Gas "bars" initially climb to indicated the actual levels after which they immediately drop to 1 bar each, and the LOPwr also indicates as you can see at the very start of the Video above.

K447 does an MFD that needs Calibration affect the Voltage reading only, or will the Fuel and Oil levels be inaccurate also? Mine was showing 0.2 volts but I confirmed 12.45 volts at the connector.

[K447]

Sounds like your MFD needs to be reset. Search "reset MFD" Lots of info on the procedure.
Good Luck

I have not been able to find the "Reset Procedure".

Does unplugging the rear connector for a period of time accomplish the same "Reset"??

I have noticed upon reinserting the connector that all display elements light up upon re-powering the MFD but the display reverts to LOPwr and inaccurate Fuel/Oil levels as well as no response to the Mode or Set buttons.

http://polarispwcknowledge.shorturl....t-things-to-do

Find the MFD section (search box in top right corner of web site), then search for the MFD calibration info and links.

Note: You will need to provide a 14.0 volt DC power source to ensure the recalibrated MFD can provide accurate voltage readings.

Just removing battery power from the MFD does not recalibrate the MFD voltage readings.


Inaccurate FUEL level may be caused by a defective (no longer buoyant) float inside the fuel sender unit. Replacement floats are available.

Inaccurate OIL level readings could have several causes, depends on the type of oil tank and sender.

[waterpest]

I have not been able to find the "Reset Procedure". Does unplugging the rear connector for a period of time accomplish the same "Reset"??

I have noticed upon reinserting the connector that all display elements light up upon re-powering the MFD but the display reverts to LOPwr and inaccurate Fuel/Oil levels as well as no response to the Mode or Set buttons.