TAKE the 30 amp fuse out !
You could easily melt a wire in an area you can't access it to replace before that fuse blows .
Yes you have a short .
You may be able to isolate the issue if you can track down a junction between the 3 strings that lit up and the two that didn't.
Once you have found that junction disconnect all lights and install a 20 amp fuse and turn on the switch , and wait , to see if the fuse blows . if the fuse holds then the switch and wiring to the junction are ok .
Hook the strings of lights up one at a time if possible and leave them on if they do work for 10/15 mins to test .This is for parallel wired lighting.
If the lights are all in series and you can locate a separation point, separate them , starting with the closest lights to the switch hook them up to test operation ; again for 10+ mins , connect the next set , if it doesn't light up disconnect immediately and remove the string and so on till all stings have passed testing . Replace strings as required.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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