ok i just installed my toyota tails black to black brown to brown colour to colour and i spliced third brake light to get brake lights to white....cut the white in the dash all should be ok right ?and almost everythign is.....except only one of my brake lights is working, the marker works fine but when i brake only the right side gets brighter, i dont understand this because they are bothe split from the same wire and i got a weak reading of 10 volts on the side that is not working, any ideas suggestions ?

um im just taking a wild guess here that the bulbs are dual filliment and 1 of them is burnt out

did you say you tied the 2 brake lights together?

sort of i used 14 gauge wire from the white wire on both the outers and spliced it all together in one spot atthe 3rd brake light power wire