Hi, I am looking for the timing marks on a '98 Ford F250 XLT. A diagram would be of great help. Many thanks

Question corrected for clarity.

The Passenger Compartment (steering wheel) box does 2002 to 2007 according to these. HOWEVER, although the same layout, so do different things depending on the year like this one.

Fuse8 15amp 2003-2004, Diesel: Back-up lamps 20amp 2005-2007: Back-up lamps

Ford F-350 (2002 - 2007) - fuse box diagram - Auto Genius

https://www.autogenius.info > ford-f-350-2002-2007-f...
May 17, 2018 - Ford F-350 (2002 - 2007) - fuse box diagram. Year of production: 2002, 2003, 2004, 2005, 2006, 2007. Passenger Compartment Fuse Box.

Ford F-250 / F-350 / F-450 / F-550 (2000-2003) fuses and ...

https://fuse-box.info > ford > ford-f-250-f-350-f-450-f-...
Fuse box diagram (location and assignment of electrical fuses and relays) for Ford F-series Super Duty (F250 / F350 / F450 / F550) (2000, 2001, 2002, 2003).

More here
https://www.google.com/search?q=2002+ford+f-350+diesel+7.3.+xlt+super+duty+fuse+box+diagram

Need help URGENTLY Have 1998 Ford Contour 2 0L 4cyl engine Car will not...

should be a diagram under hood look at junk yard for one or dealer they will usually print a copy for you some free

Mega fuse ford. - YouTube

? 1:35
https://www.youtube.com/watch?v=o9npBfNjKsU
Dec 2, 2013 - Uploaded by Mn09lfV6f
Mega fuse ford. .... Thanks Bud you saved me from getting analternator! I didn't ... 8:39. How to Find and ...

Part 2 -How to Test the Alternator (Ford 4.6L, 5.4L).

troubleshootmyvehicle.com > Ford > 4.6L, 5.4L

Mar 1, 2011 - The newer Ford vehicles use an inline fuse that goes by the name ofMega Fuse. So, before we can condemn the alternator as BAD, we need ...

Where the heck is the Mega Fuse pics needed. - Ford Truck ...

www.ford-trucks.com > ... > Super Duty & Heavy Duty

Jun 5, 2010 - 2001 F250 5.4 V8 4x4. I have had ... Even tried a new alternator and the battery light still stays on. ... 04 F350 XLT 4x4 6.0L SC/LB 4x4 ... I looked there and see one line marked FUSE but there is no mega fuse on it. .... 2005 F-150 Lariat having huge charging issue please help me, JoeJN, 2004 - 2008 F150 ... Installed battery backwards, truck wont start.
Jan 17, 2012
charging problem 99 5.4
Feb 20, 2010
2001 F150 Fuse Box Diagram
Jan 23, 2010
Fusible links and inline fuses?
Sep 17, 2009
More results from www.ford-trucks.com

here is a link to an f250 wiring diagram "PDF".... this site is a great resource for Ford trucks.... download the pdf file and you will have your answer....
hope this helps...
JP

http://www.ford-trucks.com/forums/1150860-factory-trailer-plug-wiring-diagram.html

if you look on the distributor you will see the large connector for the mudule bolted to the side. The spout connector will be within inches of the module connector.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Select Your Exact Vehicle:
1987 -1993 Ford F Series Wiring Chart & Diagrams
1994 -1996 Ford F Series Wiring Chart & Diagrams

Hope help with this (remember rated this post).

http://www.installdr.com/Harnesses/Ford-Wiring.pdf hope this link helps. Good luck. Keep me posted. 

The cause of this is not the horn or fuse in most cases, it is caused by the rotating contact that connects the horn button, in order to repair this you will need a new clock-spring contact, to install the airbag must be disarmed, his has to be done by the book or serious injury can result.