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I have installed 1157 LED from Walmart in the two tail section bulbs
They are as bright or brighter than regular incandescent 1157
I think its this one but there was only one RED type in the store with a stack of cree elements
http://www.walmart.com/ip/Auto-Car-5...2-Pcs/46547086
I have a signal dynamics voltage indicator which previously with a Gerbing would show
red (low Voltage) with the brake light on at idle.
The indicator remain green with the brake on which is over 13.75 volts
PS I do recommend the signal dynamics as a voltage indicator