That link shows USA model wiring,
Great thing about the sierra is it has two fuses, 10a and 15a
Taken from my fuse cover for the 92 WT sierra, i can check the 85 LWB in the morning if its necessary
[10][10][10][15][15][15]
[15][15][15][15][10][15]
Its good to know what they are in case you need to pinch a fuse from somewhere not used (like heater or A/C)
also good to have the cover as it fits 3 spare fuses , from memory ANY 80's suzuki car will have the same size cover
Suzuki Sierra WT 92
Headlight R / Headlight -L / tail stop/ hazard horn / radio cigar / ACC
IG Coil - Meter / heater / rear defg / wiper washer / turn back / Air con
Keep in mind when diagnosing problems the above is a rough guide
when fixing a faulty radio issue with a friends suzuki lwb vit i discovered the dash lights no longer worked, checked fuses and ok... checked another fuse which seemed unrelated and it fixed it. The details are foggy but it sort of made sense at the time being a second circuit or something but lesson was learned. Check other fuses if it seems to be zero power.
Also while talking fuses, narva manual resetable blade fuses are worth the $10 when fault finding
