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Old 01-14-2019, 08:34 PM   #11
porthole
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I asked the service center today why they use tank pads rated for 40 gallon tanks on tanks that are 50, 75 & 100 gallon sizes
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2019 DRV MS 39DBRS3
2011 F-350
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Old 01-14-2019, 08:53 PM   #12
Suite Sweets
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Porthole - I'll be interested if they respond, and for sure, what they have to say.

pterrydactyl - Ever since you responded, I've been working on trying to come up with a solution. Here's what I think will work, but check me on this - you know a lot more about electricity than do I.
When temperature is below 40 degrees
Remove the switch and cut each of the 3 wires
Put a multi-meter in line between each of the wires
Turn on the switch and read the amperage.
Multiply by 12 (voltage of the battery) gives watts
Compare watts drawn with specification cited earlier, which I got from the owner's manual of the heating pad.
-OR-
Cut the single line, wire the multi-meter in between each of the leads.
Turn on the switch and read the amperage
Multiply by 12 for watts
Compare with total wattage of 3 pads and the 23 watt elbow. I'm thinking that DRV might have drawn 23 watts off of one wire for the elbow heater, but they probably would not draw off of one wire for 2 heating pads. I conclude that because if they would do that, then there wouldn't be 3 wires coming from the switch - there would be two.
What say anybody ?
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Old 01-14-2019, 10:13 PM   #13
pterrydactyl
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Cut the tire? Can they be pulled off the switches terminals on back. Or pull the wires gently to see if they a connected somehow further down?

Watt meter inline? Something like this:

RGBZONE 130 Amps Power Analyzer, High Precision RC with Digital LCD Screen for RC, Battery, Solar, Wind Power https://www.amazon.com/dp/B01LAUKXOQ..._v7upCbVCMWKTH

This is getting to be a good mental challenge.
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Old 01-14-2019, 10:38 PM   #14
Suite Sweets
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Of course, pull the wires from the back of the switch. I hope that would have come to me before I actually cut them. I'd watched a Utube video and in that, the speaker cut the wires (different task) - monkey see, monkey do. I won't buy the power analyzer. I think that's for constant monitoring. I want to see that they're working, and then forget about them (this a new to us DRV). I'll check it out in the next week, and report.
pterrydactyl, thanks for helping in the solution.
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Old 01-14-2019, 10:58 PM   #15
porthole
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Use an clamp on ammeter. Don’t cut anything.

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2019 DRV MS 39DBRS3
2011 F-350
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Old 01-14-2019, 10:59 PM   #16
porthole
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Quote:
Originally Posted by Suite Sweets View Post
Porthole - I'll be interested if they respond, and for sure, what they have to say.
You know that deer in the headlight look ?
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Old 01-15-2019, 12:23 AM   #17
pterrydactyl
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Here is Ultra heats answer to how to check the heater pads.

https://www.ultraheat.com/faq
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Old 01-15-2019, 08:53 AM   #18
Suite Sweets
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yes, i'd read that early on. Their advise is conditioned on 'you must have direct access to the heat panel'. I don't.
I'm liking my solution (or porthole's even better if I had one of those clamp on meters) better if it will work.
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