Has anyone upgraded their wire harness and do all 9004 wire harness work for our maxima?

 

no, you only use the ones with the 9004 connector painted yellow. that signifies its for a maxima... the ones that aren't yellow are for every other 9004 bulb...

you should really convert to 9007... an ugraded harness will give you better light, but it is cheaper to just convert to the 7...

 

had it and it made a notible difference. 9004 suck either way.