89 jimmy wiring problem

hello everyone im new here . i have a 89 full size jimmy that has a wiring prob . i have brakelights on the rear pass side but none on the drivers and my rev lights dont work .rev lights come one inbetween park and rev but as soon as it goes in gear the lights go out . i can do the mech part but i know nothing about wiring . anyone have a wiring diagram for this thing or could tell me where to start . i checked all the fuses and connectors but still nothing .

thanks
billy

lites appear to be adjustment of linkage or safety nuetral switch