That is a very dangerous set up. The contactor needs to be in a NEMA enclosure (metal box) with the proper strain reliefs on the cables. The contacts will arch creating a spark every time they are engaged or disengaged and can cause a fire or explosion. The coil can also burn up and catch on fire as they often do with a little bit of moisture and vibration.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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