New in package, opened for photos...What you see in the photos is what you will receive. Posted shipping is for the lower 48. See photos for details...(JPRV-21B)
Replaced a 4 post isolator on my 1989 Winnebago Supechief with this 3 post....seems to be working correctly. The 4 post I took off was all corroded and only one of the two smaller posts was being utilized, so I figured why not just use a 3 post (not even sure if the 4 post was the original or a quick auto store replacement when it should have been a 3 post???). Anyway, this is a continuous duty battery isolator to separate the chassis battery from the house batteries, but will connect them when the engine is running so the house batteries are charged from the alternator.