ardakota Posted July 30, 2017 Share Posted July 30, 2017 Been looking all over for the ac wiring diagram for the ac unit on my 04 mack ch with the bergstrom unit can anyone tell me what supplies the power to the High pressure switch. Quote Link to comment https://www.bigmacktrucks.com/topic/50614-04-mack-ac-high-pressure-switch-power/ Share on other sites More sharing options...
Mackpro Posted July 31, 2017 Share Posted July 31, 2017 EPSON001.PDF Quote Link to comment https://www.bigmacktrucks.com/topic/50614-04-mack-ac-high-pressure-switch-power/#findComment-376262 Share on other sites More sharing options...
Mackpro Posted July 31, 2017 Share Posted July 31, 2017 Fuse 41 powers the high pressure switch. This operates the fan clutch through the engine ECM. EPSON002.PDF Quote Link to comment https://www.bigmacktrucks.com/topic/50614-04-mack-ac-high-pressure-switch-power/#findComment-376263 Share on other sites More sharing options...
ardakota Posted July 31, 2017 Author Share Posted July 31, 2017 thanks a bunch I dont know why i didnt think to check the power to that switch I have torn the wire harness part way apart and just happened to think i never checked power at the switch bingo there it was no power. I hooked fused power to in and what do you know the fan works right. Thanks a bunch. Quote Link to comment https://www.bigmacktrucks.com/topic/50614-04-mack-ac-high-pressure-switch-power/#findComment-376291 Share on other sites More sharing options...
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