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Instrument panel diode n 4W.D.actuator please help


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Im trying to figure out where the diode is located in the instrument panel?  on my 1991 K1500 4wd also  find out what  is under the cover in engine bay on R. side firewall , mainly the relay to the left?     and attached is my  original post   PLEASE HELP 

 

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Is This topic Still ALIVE ?    Help !  Mayday, MAYDAY ...a little tuffer than your standard actuator distress signal ... are You up for the Challenge ?    

 

I dunno if you still check these questions but mine is a lil more of a bugger...Imagine that ! Here goes ... Four wheel indicator light on 1991 k 1500 wont come on ...I replaced actuator , old one was good , I have power at actuator , and I verified old one functioning as well after new install , still no light . so then I replaced switch on top of Tcase ...NO LIGHT still .actually it feels like it is going into 4wd , but no light ...now heres a little detective work and some possible leads ... Im either thinking I have a failed 3.00$ diode , of which I am clueless to its location ? Or heres another ,my rear case seal has been leaking , and case is probably low , , that will be fixed next [what fluid in that aluminum case ? ATF ? } Im wondering if that might efect light operation ... here is the third clue and I dont know if it means anything ... My truck just died while out hunting in some ruff terrain , I was in 2wd , and truck stalled ... wouldnt start ..OH NO MR BILL ! anyway for some reason my injector fuse blew I replaced it and fired it up ?????? Im wondering if I didnt have some sort of sergio electronico , { thats like a brazillian gremlin } and it { Simon Taneous Lee ] thats like a cousin of Bruce lee ...Sorry I have to laff at this , cause ive wept enuff trying to fix it ... Im wondering if it didnt toast the diode ? or the low case fluid is giving me fitz ! P.S. Im clueless of the diode location ...do u know where it resides ...Thanxz sincerely Ben

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