I have a multispeed furnace fan GE P-8-7505 and would like to run the fan on low when the furnace is off, but still on high when the furnace is on. The furnace is a Lennox Conservator; still works very well with no issues at all. Can this be done?
Thanks to anyone who has some thoughts on this.

You will have to figure it out but the below relay setup might help.

Your stat should have a fan switch marked ON?AUTO switch it to ON. The fan will run 24/7 on low speed, when there is a call for heat the furnace will over ride and call for high speed.

Thanks to both of you for your replies, I think the diagram with the relays is what I am looking for, but need to clarify some of the connections. At least it appears that it can be done.
Merry Christmas!