Well I have finally earned my HVAC scout badge. Been nursing a 51 year old furnace along for about the last 10 years. A couple of years back had to change out the gas valve, switch out both limit switches and replace the capacitor several times. In the last couple of years started having fan problem. Probably a combination of the heat switch in the motor and bearings. Last spring it sprung for the last time. Took time to find the right after market replacement motor meeting all the right specs but, got it in finally last week.
Today I commenced putting it back together with a dreaded fear that I had really messed up because I did not take a picture of the wiring connections at that control box. Tried to find something online but could not find anything directly just some similar situations but it was enought to figure out the motor wiring connections. Then my old tired memory kicked in and knew there was a wiring diagram some where. I found it on one of the filter access doors. So was able to get the motor wired up and tested with the fan switch. Ohhhh so nice a quiet motor that run like it is supposed to. One little problem, I pulled two wires and then had no idea where they went. They were disconnected on both ends. Oops. Looking at the wiring diagram I realized they were the connections for the limit switches. They are in line so one connects betwee then two limit switches. That was the easy one. The other connected on the control board. Then the old memory kicked in again(actually God giving it a kick start) and remember having a dickens of a time reaching one of the connections behind a mess of other wires. Go it connected and tested and nothing. Got to thinking was it the upper or lower connection. I thought and realized I took it off the lower. The upper was a dead lead to no where. So I moved the wired down and now I got a fully rebuilt 51 year old furnace for less than $300 (parts only), save the burners but those I cleaned up and they will be fine as they are heavy duty cast iron anyway.
One question, where does one go to get there earned HVAC scout badge?