This does happen sometimes when installing wiring harnesses and is usually caused by one of three things. You will need to use a circuit tester, like the # PTW2993, to figure out which will be the cause.
First, and the easiest, will be to check the fuse in line from the battery to the ModuLite box. These are occasionally bad out of the box and will not allow any power to get where it needs to go. If it is indeed bad, replace it and test your 4 Flat. You should be good to go, but if you... view full answer...
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