Have a 98 gp 800 how do you change a cdi box and

Question edited for a lot more clarity.
Question moved to model category.

These things have fuses boxes all over the place and are a nightmare to work on :>D

Fuse Box Diagram Mercedes-Benz M-Class (W164; 2006 ...

https://fuse-box.info > mercedes-benz > mercedes-benz-...

Here you will find fuse box diagrams of Mercedes-Benz ML280, ML300, ML320, ML350, ML420, ML450, ML500, ML550, ML63 2006, 2007, 2008, 2009, 2010 and 2011, ...

Fuses W164 M-Class 2006-2011 Diagram, Box Location ...

https://www.mercedesmedic.com > fuse-box-location-d...

Fuse locations on Mercedes-Benz M-Class W164 2006-2011. Main fuse box and relay box is located in the engine compartment. Rear, passenger side in the trunk.
Model: ML 320 CDI ML 320 BLUETEC ML 350 ...
Years: 2006 2007 2008 2009 2010 2011
Chassis: 164
Make: Mercedes-Benz

Fuses W164 M-Class 2006-2011 Diagram, Box Location ...

https://mbworld.org > attachments > m-class-w164
PDF
Fuse locations on Mercedes-Benz M-Class W164 2006-2011. Main fuse box and relay box is located in the engine compartment. Rear, passenger side in the trunk.
9 pages

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You checked the pulses from the cam shaft and the 12volts to the CDI ..........?

Hi Vickie the CDI cannot be by passed the signal from the stator is different to the signal required to power the coil. The only way to bypass is change the whole system which would be costly and difficult to source parts.

The CDI box could be bad or the coil could be breaking down so maybe a new coil would fix you up they only run around 20$ cdi box on the other hand can cost an easy 100$ or better you might also try changing the oil but make sure to buy kinda thick oil cause it's cold out

Pardon me????????

obviously your fuelling isn't set up correctly

There is a way to test a CDI box but you will have to take it to a shop that has the equipment to do this. I own a motorcycle/Atv repair shop and I don't own one cause they cost allot and I can't justify getting one.