I may be worse than what Jack mentioned, in his post. There are a lot of ways to hook up after market products. Consider cutting your losses and starting from scratch. Disconnect the connections you made. Did the problems go away?
If they went away, pay homage to the RV gods and see if you can find the harness Jack mentioned. If you can not find the harness:
1. determine if you want the radio powered by the chassis (engine) battery or the coach batteries.
2. Which ever you decide will be the power source make sure the ground is for the same battery set (chassis or coach).
If when you disconnected your original wires the problems did not go away, I am sorry, but I can not help. Each coach model is so unique it may be time to let the pros take a look.
Lastly, there is one thing you can try, if the problems remain. The many connectors, in the dash area are notorious for coming loose. This is especially true if you pull the dash or are moving connectors around as you reach up under and into the rats nest of wires. The only way to determine if a connector or wires within a connector have come loose is to look really closely for wires that lead to know where. Then try to find a mating part/connector in the immediate vicinity of the lost wire/conector. This has happened to me more times than I care to count.
For future consideration, when I get a new coach, the first time I pull the dash, I run 4 new wires of my own. One set is a + and - from the chassis batteries and the other set is from the coach batteries (fused of course). I lable the wires. From that point on, the only wires I mess with are the wires I installed.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
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Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours