Originally Posted by Skamper1
Just have the one battery. Do not plan to boondock, but use 110 hook-up at campground (semi-permanent). Thanks for solving the "Power on Indicator" question. I would guess that with the new converter I will lose that feature? Should I just cap off the white wire? Power demands will be 12 v lights, bath fan, furnance, stereo, and ceiling fan/vent. Do not plan to use the pump since I will have a water supply. Appreciate the responses. Jack
Power "ON" light
UNDERSTANDING THE POWER ON LIGHT
1. The power on light IS NOT WIRED to positive voltage on one side ans negative on the other.
A. Checking the wires to the light with the trailer unplugged will show positive battery voltage on both wires. Since the voltage is the same on both sides of the bulb there is no current flow through the filament and it does not glow.
1. The positive battery voltage on one side comes direct from the battery. The positive battery voltage on the other side comes from the battery, through the univolt, and out the power on light circuit to the bulb.
2. The power on light is wired with one side to the positive battery voltage,and the other side to the power on light circuit of the univolt.
A. Checking the wires to the light with the trailer plugged in will show univolt/battery DC voltage on one side and univolt unrectified AC voltage on the other. The reading will practically be the same except one is DC and the other is AC. Example: 12.6 plus DC one side versus 12.6 AC on the other side. Since there is a voltage potential difference between the wires there is a current flow through the filament and the bulb will glow.
1. The positive DC battery current on one side comes direct from the battery. The AC current on the other side comes from the transformer windings in the univolt before the current is rectified.
Now that everyone has that information, it becomes a problem when a new style converter is installed. The following will tell you how to modify the circuitry to make the power on light work again.
A converter with a new name has been used in Airstream trailers and motorhomes, since the end of February 1988. The name is MAGNETEK, and it replaces the Triad/Utrad that was used for many years. The basic design is the same.
All functions and testing remain the same, except for the power on light circuit. In past years, the wiring on the power on light was positive on both sides (read above), and only the difference in voltage potential, AC versus DC, caused the light to function.
On the current Magnetek converters the power on circuit provides 12 volt
DC to one side of the bulb and the other side is ground. This 12 volt
power is picked up from the 18 gauge wire from the converter.
When a Magnetek is used to replace a Triad/Utrad, the wiring must be changed at the power on light in the control panel. The purple wire to the power on bulb will not have to be changed. The "black" wire WILL have to cut and spliced into one of the white ground wires.
And finally, you can have another swig, make it a long one, of your cool one.
Hopes this squares away the problem.
Inland RV Center