On the subject of Voltage. Remember that LED's are Light Emitting DIODES. They will only pass current in one direction. Think of it as a one way valve for electricity, much like a check valve works for hydraulics. They will not light if the current is flowing in the wrong direction. So if your brand new installation doesn't work, try reversing the positive and negative wires before you take it back to the store.
If anyone wants a really nice description of what a diode is and how it works read this: https://en.wikipedia.org/wiki/Diode
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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