kennethmullins
ive changed the engine and put a harness and computer on it 2007 Chevy Silverado with a 5 speed it had a 4.3 5 speed and now its a 5.3 5 speed but something’s wrong none of the lights will work 
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kennethmullins
The harness and computer are out of a 99 Silverado and fuse box
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John L.
I am not an expert, so ignore this if this is not specific enough.  By lights, I assume that you are talking about the dash lights, the headlights, and taillights?  From a 1999 to a 2007 Silverado is a big jump in years.  There are likely differences in wiring.  Do both or either vehicle have a Body Control Module?  This sometimes controls the lights.  If you have not already, you need to get a wiring diagram for both vehicles and find what controls the lights or if there are any differences between the fuse boxes and grounds that control the lights.
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