by ITBland - May 25th, 2017, 8:42 pm
Search for "Ohms Law Calculator" online (computers are good at math--
who knew? ). Put in any two of
1. Voltage (V),
2. Current (Amperage)(I), or
3. Resistance (R)
to calculate the third value.
http://www.ohmslawcalculator.com/ohms-law-calculator this one includes power, but that is just V*I.
At 12.6v and 2.2A, 6 ohm would be just about correct (without the bulb), but the power draw would be 27W, too much for a 25W rated resistor. (At 14.3V it is ~31W!)
The Switchback bulbs are 6.5W
http://www.jdmastar.com/product/321/3030-SMD-3157-White-Yellow-Switchback-LED-Bulbs-Set-of-2.html, so you are drawing too much current. We need ~20.5W additional current draw (at rated 12.6V) to match the 3457 bulb, so the 8 ohm resistor should be correct
IF connected to the correct wire
. If it is connected to the parking light filament, then it is doing you no good (I wonder if this is what is wrong
.)
HTH