is it possible?

[m4i2k2e2 10+ year member]

ok, i put in an old rockford fosgate HU. now, that turned on but the display didnt work. the lights turned on though. i put my HU in that i was using before i switched them out. that worked fine. now that wont even turn on. i checked all possible fuses. could i have junked my sony HU?

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[m4i2k2e2 10+ year member]

i put a bigger fuse in the fuse panel of my truck i went from 10 to 15. could that of hurt my HU?