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Alternator problems

Old 03-13-2019, 08:41 PM
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Default Alternator problems

Does anyone have a part# for 5 volt resistor needed to excite alternator? Or where I can order it
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Old 03-13-2019, 10:24 PM
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Resistors are not rated in volts. Its a combination of ohms (resistance), watts (for power handling capacity) and tolerance for accuracy on the specified resistance. I think you are looking for a "pull up" resistor but I don't know the value you need. My guess - please don't take this with 100 percent certainty - would be 4700 ohms in a half watt or larger size for power handling. Go larger on the wattage here if you must compromise. Somebody around here will know better for certain exactly what you need.

I order piece parts like this from Mouser Electronics or Digi-Key although I do have a local fellow with a brick and mortar store for some of these sorts of things. Without Radio Shack, its the Internet or nothing for little things like this.

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Old 03-14-2019, 06:02 PM
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If an alternator warning lamp is used, a resistor should still be used, in parallel with the lamp. This is so that the bulb burning out does not prevent current flow and therefore alternator excitation. The resistor should be equivalent to a 3-4 watt bulb. Using Ohms law, we can use the Electrical Wheel of Doom from Part 1 to calculate the required value of the resistor as R = V^2 / Watts. In this case R = (14v*14v) / 4W = 49 Ohms. So a 50 Ohm resistor will do.
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Old 03-14-2019, 09:46 PM
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Thanks I think I can figure it out from here. Didnít know that it was ohms not just volts to figure out.
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