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Son of Samurai's Blog

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Can a Range Run on a 9 Volt Battery?

Son of Samurai

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Here's something you don't see every day: a gas range that is powered only by a 9 volt battery. Pretty nifty, huh? @Littletexan told us about his encounter with this one in this post from a couple weeks ago.

Let's look at some of the unique aspects of this model. We'll start, as always, with the schematic:

Screen Shot 2020-03-04 at 12.33.52 AM.png

Well that's about as simple as it gets! All mechanical controls -- nothing too fancy going on here.

One thing I will point out is that, while the schematic seems to show a grounding wire coming off that ignition module, the module is actually grounded through one of its mounting tabs. If you look at the picture below, you can see that one mounting tab is plastic, and the other (circled in green) is a metal grounding tab.

EDIT: A small clarification -- that fourth terminal on the spark module is in fact tied to ground. It's just not via an external wire, as you might expect from looking at the schematic. Rather, that terminal is internally wired to that grounding tab. This is because it's an unused terminal of the module -- you can see from the picture below that there's no spade coming out of that terminal (circled in yellow) -- and so it is tied to ground to safely discharge the spark voltage that gets sent to it.

Ignition-Module-WB13K10053-04642475 2.jpeg

With how simple this machine is, there's only one problem that can really fake you out. What do you do if your battery checks out with a good 9 VDC, and all of your other components check out, but the range still isn't sparking?

Littletexan encountered this, and believe it or not, the problem turned out to be no more than a bad battery. While the battery showed a good 9 VDC when checked without any load, as soon as one of those burners was turned on, that voltage dropped down to 6 volts. This is an interesting twist on the loading down problem I've talked about before. But instead of a defective DC load causing the problem, the problem was a defective DC power supply (battery). 

One of many interesting discoveries by the sharp techs around Appliantology! If you want to get in on the action, with access to all of the tech-only forums, manual downloads, and 45+ hours of technical webinar recordings, then click here to become a premium member today.

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Budget Appliance Repair

Posted (edited)

Actually the chassis ground that is shown on the diagram isn't the grounding tab on the spark module.

This is a four electrode spark module that only uses three of the four spark electrodes, (left set of burners, right set of burners and a oven burner),  the forth unused spark output on the module is tied to chassis ground to keep the module from building up energy on the unused output.

I've seen this same setup in other ranges that have five surface burners that actually use two spark modules - a 4+0 and a 2+0 to cover all 5 separate sealed surface burners - the unused output on one of the modules is grounded in the same manner, (I think this was either on Brown range or possibly a higher end model - I don't remember for sure but do know I've seen this done before).

EDITED TO ADD: looking at the part picture closer it appears on this spark module they don't actually have a terminal on the forth output but I suspect that the forth terminal that appears to be stubbed off in this case is actually tied to that ground tab on the module.

Edited by Budget Appliance Repair

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LearningTech

Posted

I worked on some of these that were converted to propane as well. Owner just wanted it to work with the power out kind of neat units. 

I was actually not too long ago was looking for this part number to  add spark to a grill, and now i have it, thanks.

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