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Old 10-11-2010, 03:13 PM   #15
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..... Radio Shack has 12v LEDs with the resistor built in at reasonable prices.
Don't mean to hijack this thread, but guess I am. What do you mean
"with resistor built in"? I just ordered a 12v green led for a water-pump-ON
indicator. I was planning to hook it in parallel where the 12v power line enters
the pump. Whats this resistor stuff?
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Old 10-11-2010, 04:38 PM   #16
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Don't mean to hijack this thread, but guess I am. What do you mean
"with resistor built in"? I just ordered a 12v green led for a water-pump-ON
indicator. I was planning to hook it in parallel where the 12v power line enters
the pump. Whats this resistor stuff?
LEDs are available with or without a built-in dropping resistor. If you hook one without a resistor directly to 12V, you get exactly one very bright, but very, very short burst of light. The Radio Shack LEDs have the resistor built in so that you can tie them in to any 12V circuit without any other component required.

I have some LEDs without resistors as telltales for other switches in my trailer. For each of these LEDs, I used a resistor from my parts box to limit the current.
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Old 10-11-2010, 05:20 PM   #17
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Switches that light up when "on" can be purchased in various colors at most auto parts stores. Most are "rocker" switches, which are nearly flush when installed.
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Old 10-11-2010, 06:07 PM   #18
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Switches that light up when "on" can be purchased in various colors at most auto parts stores. Most are "rocker" switches, which are nearly flush when installed.
They work fine, but it is better to use the existing switch with a LED whenever possible. Both of my water pump switches, for example, are integrated with other switches or built into my monitor panel.

Also, the water pump in most models is controlled by a 3-way circuit with switches in the bathroom and galley. The LED must be installed at the pump or after the last 3-way switch. Mine is installed on the monitor panel which is the last switch in the circuit.
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