Posted by AndrewFromNS on December 05, 2008 at 16:06:42 from (71.7.194.23):
Hello All,
I've recently got around to installing an I9 Dash on my Super-C, to house my charge indicator light and hour meter. Since I don't really like the looks of the rather large, automotive-style bulb that was on the tractor when both I and the previous owner (TractorSam) purchased it, I decided that I'd do something about it. I work with LED's a lot, and figured an LED Indicator would work just wonderfully in this situation..
Looking at Bob M's wiring diagram #5, I see that I need to have a ~200mA draw across that bulb. It's my understanding that the automotive-style bulb thats in there now is one of the recommended ones thats supposed to draw about 200mA. The LED I'm working with is 25mA and 2.1V, so I calculated that I needed a 470-ohm resistor to allow the LED to survive 13.4V.
When I fired the tractor up tonight to test everything out, I noticed that, despite me throttling up to activate the alternator output, the LED stayed lit. I shut it down, and started it again, and noticed that the LED stayed lit even after the automotive-style indicator bulb had shut off.
Anyone have any helpful hints or suggestions? I like to think I'm decent with electronics, but events like this sort of leave me standing there thinking "Wha?".
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