changing 66 bezel to 65 with lights

[powd]

Hope someone can help
I changed my 66 bezel and gauges to a 65 bezel with lights also switched out dash harness and engine gauge harness to a 65with lights...
Car was running great brefore i did this now I have no charge at all. no electric.
I didnt change the headlight harness so I dont know if thats part of the problem? anyone have any ideas? mustang has a 302 in it...
Thanks
DP

[sixystyle]

do you mean you have no power at all? no headlights,no interior lights, no anything?