Freightliner Clicking when you press starter button

I love the 39mt......over 2000 cranks so far, Half the weight too

 

I'm no expert, but welding next to a rack of batteries doesn't sound very safe... Unless they were removed?

 

Thanks I'll give that a try tomorrow,
I guess it could be my key switch itself.

 

Also at night time my truck is drawing power and looking voltages low power beeper goes on and I can't use interior lights or anything till I start it and charge it back up, going to be an issue once I have to use cab heater in winter, and a/c clutch is not getting power not sure if these are all related.

 

Any solution from the original poster?