Your 2006 camper would have the WFCO brown plastic cover power converter right? If so, that is a newer 3 stage charger.
The furnace draws a lot of power to run the fan motor. But that should not dim the lights, it sounds like you have something else going on.
Do you have a battery installed? and is the battery disconnect switch turned on?
If you have a battery, do you know if it is any good? The Sunline power converter installed should be close to a 50 or 55 amp converter. If the battery is real bad in shape, it can be using a lot of the converter power trying to charge it and not getting anywhere. Only about 20 amps or so will make it into the battery on a good day. But this also depends on how many light bulbs you have one at once and if they are the original 921 incandescent light bulbs.
- Tell us the make/model of the converter.
- Tell us how many lights are on when the furnace is running? and if they are still the original 921 incandescent bulbs.
- Tell use something about the battery.
- Tell us if the main slide drive goes in and out OK, no furnace, just lights. The slide motor is a large current draw also. If if is acting slow, then you are loosing power. Also try the slide without the lights to and see if the slide works faster or better.
By chance, you have have a volt meter that can read 12 volts DC? When all this light diming is going on, testing the battery voltage at the battery with the disconnect being on will tell a lot about what the power converter is doing. You need to read the voltage with one decimal point or better. Like 13.3 or 12.3. Tenths of a volt mean a lot when you only have 12.7 volts on a good day.
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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