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Old 12-03-2007, 07:54 AM   #1
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I was wondering if anyone knows if my Engine block heater is also some how hooked up to my generator. The reason I am asking is that I turned on my block heater this morning because I havent started my motorhome in about 3 weeks it is about 20 degress outside and I turned the block heater on for about 2 hours before starting the coach. All was fine coach started right up glow plug light didnt come on,So I know my block heater is doing its job. But what I dont understand or know is the generator. I held the genorator botton in and within 5 seconds the generator started up the glow plugs didnt need to heat up at all. So I was just wonder ing if it is all tided in together as one or did I just get lucky that the generator started that easy.Thanks Ron
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Old 12-03-2007, 07:54 AM   #2
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I was wondering if anyone knows if my Engine block heater is also some how hooked up to my generator. The reason I am asking is that I turned on my block heater this morning because I havent started my motorhome in about 3 weeks it is about 20 degress outside and I turned the block heater on for about 2 hours before starting the coach. All was fine coach started right up glow plug light didnt come on,So I know my block heater is doing its job. But what I dont understand or know is the generator. I held the genorator botton in and within 5 seconds the generator started up the glow plugs didnt need to heat up at all. So I was just wonder ing if it is all tided in together as one or did I just get lucky that the generator started that easy.Thanks Ron
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Old 12-03-2007, 09:41 AM   #3
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Another Pennsylvania resident here with the same 20 degree weather over the weekend

Your CAT engine doesn't have glow plugs, but rather an intake air grid heater. Basically, when cold, it passes 12 VDC through a grid of wires heating them. The intake air entering the engine passes through this grid heater and is preheated when it enters the engine. The heated air lets the engine start more easily.

The intake grid heater operates when ever the air temperature summed with the coolant temperature is less than 130 degrees.

When you operated the block heater you heat the engine some which can prevent the intake grid heater from coming on. I'm actually surprised that it didn't come on at all, but if you were able to heat the engine to 65 degrees, then the intake and coolant would be at that temperature so when summed to 130, the heater wouldn't run.

An easy way to tell if your block heater is working is to watch the AC amp reading on your EMS system and you'll see it increase when the block heater is turned on.....and yes, it will automatically run off shore power or the generator.

Usually when I start the generator in cold weather it does seem to take around 5 seconds of holding the start button down (which heats the glow plugs) before the generator cranks and starts. There is no "block heater" on the generator, only the glow plugs which heat inside the combustion chamber prior to starting.
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Old 12-03-2007, 10:39 AM   #4
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Joe Thank you for the information.You have been very helpful.Ron
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Old 12-04-2007, 02:14 AM   #5
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Joe , not to hijack the thread, but good to hear from you again and congrats on your pending sale...Just shows again that clean well cared for coaches are not hard to sell...Happy Hollidays to you and yours,,Jim
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