To; Karl;
I have an02 MADP on a Spartan with Cummins.
Don't know set-up of 03 DSDP, but let me tell you where my fuse locations are, you may have same locations.
Removable panel on dash above instrument cluster, about 30 fuses and relays.
In the bay with the 50 amp power cord, 8-12 fuses behind plastic cover. Both covers ars secured with velcro.
As "007" stated, check grounding under dash and connections behind guages which can be seen when fuse cover on top of dash is off.
Hope this works and good luck== Aime=== AJBJRVERS
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