1996 XP ran great when winterized, now nothing

[BCRSKI]

Last fall this thing ran like a beast absolutely 0 issues, went up the other day to restart it, hooked the battery up and nothing. no beeps no lights, nothing. I checked the fuses and lines and it all appears to be ok. I jumped the starter solenoid and the motor spun over great but didnt have spark which makes me believe its a computer issue. what else can I test before I start throwing money at it? The trim system also works great but nothing on the dash lights up at all. Also the battery was removed for storage. Ive attached pictures of the wiring below, I did the test where you push the start button five times without the fob installed and got nothing. When I install the fob, no beeps. The first picture above is of a wire that is not plugged into anything. I did not unplug anything from it last fall but noticed it dangling free, but nothing near by that would look to plug into it.

 

[artr]

The MPEM controls the spark so when you spin the motor by just shorting across the start solenoid you will not get spark. Because you get no response from the start button an key it sounds like your MPEM is not getting power (assuming your beeper is still working). Did you also check the fuses in the rear electrical box? Power to the MPEM comes from the rear electrical box through the 15A fuse on the red-purple stripe wire. Check power at the MPEM on that wire if the fuse is OK. There are a couple of strange things in your photos. Where does the disconnected wire go to? Your battery has 2 red leads and 3 black leads. A stock 96 XP would only have 1 red and 2 black. Where are those extra leads going? You said the trim system is working but you could also try disconnecting it to see if that makes a difference. You could also try disconnecting the red wire from your regulator that goes to the MPEM to see is that is interfering with the power to the MPEM.

 

[etemplet]

Download the wiring diagram and trace the wires from the DESS Post. If you're not getting anything that is where I would start. My XP did the same dang thing. I didn't ride it last year and a couple weeks ago I installed a battery and figure it would turn right over and start but... it did nothing. After I installed and removed the key a few times it began to cooperate. LOL Sort of.... "Wake up Sleepy Head."

That plug is something I would investigate and it is always good time spent looking at the wiring diagram.

Also, if your Mag plug is not plugged in the ski will do nothing You might want to unplug that and make sure it is clean. Good Luck !

 

[BCRSKI]

I checked the fuses in the rear electrical box and they are good. That wire that is not connected to anything actually attaches to the 15 amp fuse with a red wire with stripe and a black wire. But I pulled out the battery and searched all over for a wire that could plug into it and found nothing. But the extra positive and negative wires from the battery go to that group of wires in the plastic box shown in the same photo of the unplugged wire. That box contains a couple of relays that get powered from those wires from the battery. The plastic box is definitely not OEM. Could someone have set up some sort of bypass to the rear electrical box? Are the relays standard?

Regarding the wiring diagram, is there on line access to that? What is the Mag plug I should check?
Thanks.

 

[mikidymac]

What you have going on there is anybody's guess since Seadoo never wired them like that or used Tupperware.

 

[etemplet]

Yea trying to sort the wires and where they go is a slow process. With the diagram you can see just where the go and what they do so it is a benefit in that respect. You can download the manuals here or become a Premium member on the forum and download them from the forum. The wiring diagrams are generally in the last section of the manuals. Good Luck !

Manuals

 

[artr]

Etemplet recommended downloading the wiring diagram which is in the 96 shop manual at seadoomanuals.net. He also said to check the Magneto plug that is on the front of the engine on the Magneto cover. It connects the Magneto coils and the ignition trigger signal to the MPEM.
I asked about if 12v power is present at the MPEM on the red wire with the purple stripe. If not then maybe something in the extra box is interfering with 12v to the MPEM. You probably want to draw the modifications on a stock schematic to figure out what the extra box is doing. Maybe posting a picture of the extra relays showing their part numbers would help identify what they are intended for.

 

[BCRSKI]

Good news, it was a fuse. I pulled out the MPEM and opened it up and found a fuse in there that was blown. Replaced it and now have power as normal. Thanks for all the input!

Definitely have some non OEM mods in the wiring I will have to figure out at some point.

 

[Poormanracing]

Make sure the ground wire to bottom of or going to the block is good.if it was me I would try and find a junk ski and rip the harness out of it.that thing is a mess and a fire hazzard

 

[harleytq]

I'm guessing the extra wires and relays are a bypass for the VTS, similar to the Trim Fix, but maybe a home made one?