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Old 08-25-2011, 05:34 PM   #1
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Wire for Diesel Block Heater

I recently installed a 1000 watt block heater in my Cat 3126 engine and would like to have something more than just the usual 120V AC plug with an extension cord to a campground or residential receptacle.
Has anyone done a wiring mod for their gas or diesel block heater, to make it more convenient or automatic to operate?
Perhaps incorporating a relay, a timer, an inside switch, and/or pilot light?

'96 Safari Sahara, 250hp Cat

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Old 08-25-2011, 06:06 PM   #2
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On my tow truck years ago I had a timer on mine to save me money. I usually got calls from 7Pm to 4AM so the timer was set for 6Pm to 4Am.
Just a regular $5 houshold timer will work fine.

(RVM#26) THE U-RV 94 F-700/24 foot U-haul box home built RV
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Old 08-25-2011, 06:11 PM   #3
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The way Winnie wired mine was to simply install a switched 120v outlet in the electrical bay controlled by a switch labeled "engine heater" on the inside of the rig.

Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

2007 Itasca Ellipse 40FD
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Old 08-25-2011, 06:26 PM   #4
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Mine is plugged to the coach power system and there is a switch in the bedroom for it. The switch actually controls an outlet near the engine and the block heater is plugged into that. That way I can still plug the heater into an external source if I want. It also gives me a switched outlet that I can use to power outside lights or whatever.
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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Old 08-25-2011, 06:47 PM   #5
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Mine is at the foot of the bed, lights up when turned on. Our dog kept turning it on and I installed a screen door pull over it like a mini bumper so to stop this from happening. To track down the guilty party, I put some tape with sticky side out nexe to the switch. Caught several clumps of fur! Also congrats on 8,000 posts Gary RVRoamer!
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