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Old 10-09-2012, 05:42 PM   #1
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Tiffin Owners Club
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Posts: 290
Engine preheat

On my 2006 Zephyr, I have a switch called engine preheat. When in the on position, I have no indication that it is on as the light on the rocker switch isn't lit. It will light if I turn on the ignition key. So, does this switch work with the ignition key off?

Thanks Karl and Janet, 2006 Zephyr 44QDZ

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Old 10-09-2012, 05:46 PM   #2
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My guess is that it would not work unless you are plugged into shore power ?

Don and Nancy
[2017 Tiffin Bus 40 AP, 2018 Jeep Unlimited Sahara JL 6yr old sisters Sara n Kaycee, Havanese, Two Electric Bikes
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Old 10-09-2012, 05:47 PM   #3
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A good question for the Tiffin help line. Give them a call at 256-356-0261 normal business hours and they'll give you the straight skinny. Be sure to have the last 6 of your serial number handy.
2013 Tiffin Allegro Bus 43QGP
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Old 10-10-2012, 11:08 AM   #4
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The engine pre-heat function warms the coolant, thereby lowering the viscosity of the engine oil and allowing it to start under less of a load and helping the oil to reach the upper cyclinder levels more quickly. I tend to turn our engine pre-heat on the evening before a coach movement the next day when the ambient temperatures are going to drop into the mid to low 40s F. This feature functions only when the motorhome is plugged into shore power. As always, oRV
Orv Hazelton
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Old 10-10-2012, 05:41 PM   #5
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Thanks to all who responded. My problem was that I had to have the ignition key on for the preheat to work. Turns out that the switch was wired wrong, It was connected to the ignition side of the fuse strip instead of the battery side. I moved the connection to the battery side and all is well.

Karl and Janet Zephyr 44QDZ
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Old 11-29-2012, 08:36 PM   #6
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Would having you generator on be good before starting on a cold morning
Would that not be the same as shore power
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Old 12-01-2012, 05:38 PM   #7
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Yes it would be the same ac power, but it takes several hours for the block heater to warm the coolant, depending on the outside air temp. So unless you enjoy getting up real early, most people turn on the engine pre heat the night before they depart. Richard
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Old 12-02-2012, 05:26 AM   #8
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Since the generator is also diesel, it may not start, also hard on it to say the least. If you are going to be in cold weather, say 30 degrees or below, make sure you have an antigel added to your fuel. Also have shore power. My Tiffin manual says a minimim of 3 hours with the preheat on before starting. I turn my preheat on before I go to bed.

Karl and Janet 2006 Zephyr 44QDZ
Karl and Janet
Tiffin Zephyr 45QDZ
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Old 12-05-2012, 07:20 AM   #9
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Preheat on before bed always. I also use a small flag reminder to turn it off the next day because it will eat batteries alive if left on. In all the stuff I have to do to leave it is easy to forget to turn off that switch.
Mel (Melanie) and Harry
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Old 12-05-2012, 08:27 PM   #10
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My engine perheat switch make for a great night light as the grandkids say it to bright I have been thinking of replacing the lamp with a 24 volt lamp. That would dim the light when the preheat is on.


Jerry & Anna
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