[RodeWorthy]

Jim,
You did not say what the shop worked on when they had it for 6 weeks. Also, it is likely your batteries discharged if it was sitting for any length of time at the dealer with the switch on.

If the dealer opened the hydraulics for any reason it is possible that there is air in the system that needs to get purged out. But the biggest clue to me is the buzzing noise you hear when trying to extend or retract the landing gear. This to me sounds like low voltage under load. What did you use to determine the battery was 100%? A couple of things you could try if you have the necessary tools. Connecting the truck battery to the Suites battery via jumper cables should provide the necessary voltage provided everything else is in good repair. Leave the truck running after you connect the jumpers. If the pump operates properly under this condition you have an electrical problem that needs to be solved. It could be only bad battery but it is also possible there are problems in the wiring and/or charging circuit. The pump circuit draws a lot of current (around 80A) in both the extend and retract mode on the landing gear so do not excessively run the hydraulics with this setup. It is only a test to determine if the battery circuit is the cause.

A hydrometer test of each battery cell is the best indicator of the charge condition of the battery. It can isolate a defective cell as well as determine the charge state. If you do not have the equipment for this a battery shop can do the test and also put a load test on the battery to test its ability to maintain a charge to power the camper.

Loose connections are also a possibility. But be aware working around batteries with tools can be very dangerous. A short circuit of the positive posts to a ground through a wrench can create an instant welder and could cause the battery to explode. This is particularly true if the battery has recently been charging. The gas given off by a charging battery is explosive.

Hope this helps. Let us know how you make out.