If you replaced all of the fuses than your pig tail is loose , unhook it then blow it out and connect it back firmly into the electrical socket
'11 cascadia code chs 71 spn 520409 fail 04
Discussion in 'Trucks [ Eighteen Wheelers ]' started by marcusthegreat, Jul 29, 2016.
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The flasher control module for the trailer is in that box under the hood too, 1 flasher unit for each side of truck, try swapping them over.
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It was the relay... I replaced it and it's fine now thanks!
SLCTrucker Thanks this. -
Cool, when mine went bad I just changed both...
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Before thinking the worst just replace and check all of the small parts; Lol $20 fix over a $125 check and advise from freightliner any day.
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Yea I learned that the hard way!marcusthegreat Thanks this.
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Truck won't crank
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Sound like the starter went
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Yep got it replaced
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