I recently purchased a motorhome equipped with the Duralast inverter. The previous owner had plugged an extension cord into it.

What Cord?

Your asking about plugging it into the homes
electrical outlet ?

Can't use just any cord,not a two prong lamp cord
type extension,no

You use a three prong grounded extension wire

Does it not have several feet of wire on it & a three
prong plug?

You use a standard outdoor extension, like you
would for a vacuum cleaner outside

If you use it a lot, buy a short 6 foot one,just to
use with it

How about the owners manual ?

Most often the furnace is run off from propane.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Experince tells me that you have one (1) of two(2) problem's...The first being a fuel problem, the second being a security problem . To assertain which, have a diagnostic ran on the vehicle .

We do not have owners manuals for motorhomes. Sorry.

Pick up a Chilton repair guide and it should list the vacuum diagram

I think the previous owner needs some heat--inspec system-the vacuum controls on the panel cud hav issues or the heater door or the core itself--get a repair manual from fixya or a parts place

Is your generator wired in to an automatic switchover in the motorhome, or do you have external plug in on face of generator, or near it. The power from the generator needs to be attached one way or another to the motorhome. It may be as simple as plugging the cord from motorhome into it, depending on what set-up you have.

Hello,
Well the original owner may have got taken. I suggest looking nowhere near the air cleaner for the factorry installed Dodge, Chrysler, Jeep, Eagle block heaters are mounted on the side of the engine in a freeze plug port. There was an option available for the 4.0L and had a removeable 110 volt plug. You want to look on the side of the engine block and look for a 110 volt cord or a freeze plug with two electrical connectors sticking out. You may have to order the electrical extension cord from the dealer and is VIN specific. You may have to call a wrecking yard or dealer in Canada.
Good Luck.