If your batt was installed backwards the the reverse polarity fuses are probably burned. They’ll be in the fuse panel. I did that once and the reverse fuses (4) and fuses in both thermostats were gone. Your radio may be protected by the fuse panel and maybe another behind the radio.
Start by checking ALL fuses then check all 12V things to see what else has been affected.
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Cheers,
T_
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks
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