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Old 02-10-2019, 04:59 PM   #1
Join Date: Nov 2017
Posts: 46
Furnace Blower Motor and Voltage Issue

I have a 1994 Itasca Suncruiser with a Suburban SF42 furnace. My blower is not turning on in my furnace. I verified the motor is receiving power from the time delay switch, which I replaced recently. A couple months ago, I had to replace my sail switch. So, it is possible the things is crapping out piece by piece. I have two questions. First, is there something else I should check before replacing the motor. Second, my voltage reading bounces between 13.74 and 14 on shore power and when my battery bank is at 100%. The furnace says the optimal voltage is between 12 and 13.5. Is the higher voltage killing my equipment? If it is, can I install a voltage regulator on the hot wires to drop the voltage to the correct range? Thanks!

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Old 02-10-2019, 06:25 PM   #2
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Join Date: Nov 2015
Posts: 9,696
1st.....Furnace motor
Timed Delay Relay has 12V DC directly

THEN when t-stat Closes...12V DC is sent to other terminals on Relay.....this then allows the DC to go to motor and start it.
Motor comes up to 75% speed and closes Sail Switch....allows DC to go to limit switch then to circuit bd

Test motor function by removing Hot DC Wire from Relay and jumper to Wire on opposite side of relay (wire to motor)

2nd ,,,,DC Voltage
Sounds like Charger Circuit for batteries is failing
DO you have a Converter?

Inverter with charger?

Is it time for YOUR medication or MINE
2007 Dodge 3500 w/Tractor Motor & NUWA 5vr
US NAVY---USS Decatur DDG-31
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Old 02-11-2019, 02:28 AM   #3
Join Date: Nov 2017
Posts: 46
Motor Test and DC Voltage

I jumped the hot wire to the motor directly. No response from the motor.

I have a converter. I also have an inverter and an MPPT charge controller as part of my solar set up. The converter is original to the RV.

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ace, furnace

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