Well if the Tropper is remotley close to the Rodeo, than you don't have a starter switch, it's integrated in the ignition key. The relay should be ok, just check to see if it works by shorting the 85 to 86 & listen to it click. If it dosn't than it's not working.
Check the fuse & just unbolt the old one & bolt in the new one.

Should take you no more than 1 hour to do it.

rubo

"If i can't crawl over it, i'll fly over it"
rubo

'96 Amigo 4x4, 3.2L V6, 4L30E, D44 rear, SOA, 1" BL, undergoing surgery.
'00 Rodeo LS 4x4, 3.2L V6, OME 919 Springs, front cranked to match,1" BL, 265/70x16 Scorion A/T's.