We'd need more information to try to help. The KEYTV system is installed in most Bullet trailers after about 2018. That system MAY be installed on the same fuse as your radio. If you have KEYTV, troubleshooting will be different than if you have an older trailer without that system.
First, as posted above, if you hooked up the battery backwards, your power center has two "reverse polarity fuses" installed that will blow to protect the power center from damage. Depending on the age of your trailer, they may be installed on the converter or they may be installed next to the 12 VDC fuse panel in the power center.
So, a more complete description of your trailer (year and model), photos of your radio or a more complete description, photos of your power center or a more complete description and information about whether you have KEYTV installed would be helpful.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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