I live in a mobile home. I had the furnace replaced last year. The old one had two places to plug the blower into. One was for the heat, and the other was just to have to blower running by itself. I would like to be able to have just the blower on by itself. How do I do that?

Did you get a new t-stat with the furnace? Probably on there look for fan on.

It did not come with a new t-stat. But I do have a digital one installed. From the furnace the red wire going to Rh and white wire going to W. I know that on the t-stat, G is for fan. Which wire from the furnace, green or gray do I hook up to G so that when I switch the switch on the t-stat from auto to fan, turns just the blower on?
The model of the furnace is M1MB 070A AW if that matters.

Should be green, gray would be fore ac

I ran a wire from the green wire from the furnace to G on the t-stat. And nothing happened when I switched the fan to on.

Anyone else have any ideas to make this work?

I ran a wire from the green wire from the furnace to G on the t-stat. And nothing happened when I switched the fan to on.

Does the tstat have a fan only setting? Has /does it need to be programed?
You may need to get out the installation manual and look it over ,Joshdta told you right ,green from furnace to g on tstat,must be in setting of the tstat

The t-stat has a fan switch for auto and on. There is a jumper in the t-stat that I tried in both spots. And the t-stat is not programmable. So I guess my furnace is no able to have just the blower on by itself. And it is not important enough to pay the furnace guys to have it do it.

But thanks everyone for trying.