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The reason I always disconnect the negative terminal first, on the car or RV, is for safety. If you are using a wrench on the positive terminal and it touches any metal on the vehicle ..... spark.
I put a knife switch on the negative terminal to disconnect the batteries.
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Butch and Kathy
2016 3160RL Legacy, Sailun S637, Centramatic Balancers, 2-T105s, Amish Refrigeration, ARPrv, SoftStartRV, FlexArmor roof
2016 F350 6.7L SRW
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