89 Caprice...No tail lights, turn signals or hazards

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20amp fuse for tail lamps blows. Replaced the headlight switch, checked for broken wires, replaced hazard & turn signal flashers. Fuse still blows same lights are still out. I have head lights & brake lights tho. I've searched everywhere on the Web but I can't find anything but wiring issues which I've checked front to back of car. If anyone has any advice please help?!

There are a lot of spliced/added wires so I don't know how much of a help a wiring diagram would do...

Thanks in advance!

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Has any work been done before that? When did this occur

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Yes, they had a stereo system installed but he claims he had no tail lights or signals before that.

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