ok, again... why would they wire the wipers different for a diesel equipped truck vs how they are set up for a gas truck? I don't know for sure but I can tell you the 89 to 91 trucks didn't have a PCM like the gas trucks did. The 91.5 intercooled truck is a read headed step child with a half year only controller. Your son's 92 has a PCM and is different from both the 91's, non intercooled and intercooled. So don't take your 91 service manual for gospel. Either way in the long run why does it matter why they did it that way? It is what it is.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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