Battery Master Switch

[SteveW]

Having been advised that the failure of my Diesel Heater to start was most likely due to poor electrical connection between the batteries and the heater - particularly amongst the heavy cables - I started with the Battery Master Switch. I started there because it had become a bit dodgy when turning it on and off. Success first up. The contacts of the switch were showing up dirty and pitted. Also, the plastic body was distorted and cracked at one of the two terminals - clear sign of overheating. The plastic disintegrated in part during the dismantling process and was not able to be re-assembled.

In order to perform a few electrical functions prior to putting the motorhome back in its shed, I bolted the positive cable lugs from either side of the switch together to make a good connection. Tested the diesel heater while the cables were bolted together and bingo - Diesel heater started.

Off to buy a new Master Switch.