Outback 342 CG Toy Hauler Furnace Issue

[Patchwork Farms]

This is my current predicament. The history is as follows:
The heat was not kicking on in my travel trailer so I tried adjusting the thermostat temp up. That did nothing. I went outside and opened the side access panel which exposes the back of the furnace. What I found was 3 or 4 groups of wire junctions that were simply secured with black electrical tape ONLY. I grabbed them one at a time and sorta wiggled and pinched them. Then the system made contact and started. I didn't have any wire nuts to properly secure them so I left it be for the time being. In doing so in this manner, a couple of the smaller wires had fallen loose and I have no way to know which one goes where. I looked at the wiring diagram for the furnace that came with the trailer but I'm not really an electrician and I don't want to screw this up.
The attached pictures I took this morning simply to show you where it stands currently. There are (2) blue wires marked Thermostat. (1) red wire marked +24 VDC. (1) Red wire with white stripe. (1) white wire. (1) black wire with white stripe (probably is -24 VDC I'd guess).
As you can see, I acquired a few wire nuts and twisted some of them on. The connections are most likely wrong. Can somebody please advise me exactly which wires get connected together?
Thank you very much

[chuckster57]

Pics look like the back of the fridge.

Furnace will have 4 wires:

12V positive
12V negative
2 thermostat wires.

You should have 4 wires coming from the trailer:
12V positive- probably white with a colored tracer
12V negative- probably solid white
2 thermostat wires- could be another pair like the power/ ground or could be small thermostat wire.

Use a Volt/ohm meter to verify the 12V supply and connect to furnace. Then locate the 2 thermostat wires and connect to the 2 blue wires from the furnace. You should have 4 separate connections.

That should do it.