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What size resistor to use when replacing turn signal bulbs with led lights?
Wiki User
∙ 13y ago
To make the flasher unit function properly, you need to put in a resistor that equals the resistance value of turn signal circuit. If the resistance is too low, then the turn signals will flash too slow, if at all. If the resistance is too high, then they will flash to fast.
To find the total circuit resistance (if all the bulbs have the same resistance), you measure the OHM's value of a bulb and then divide the value by the number of bulbs in the circuit.
Example: If you have 4 forty OHM bulbs, then the circuit resistance is 10 ohms.
Another way of finding total resistance (if there are two bulbs with different resistance values) is to take the product of the values and divide it by the sum of the values,
Example: 1 forty OHM bulbs and 1 Fifty OHM bulbs; 40X50= 2000 & 40+50= 90; 2000/90=22.22
A third way to find total circuit resistance (if there are three or more bulbs that have different resistances) is to take the each resistance value, divided them by one, add them and divide the sum by one.
Example: 1/ 1/r1+ 1/r2+ 1/r3
1/40= .025 & 1/50=.02; .025+.025+.02+.02=.09 & 1/.09=11.11 OHMs.
Wiki User
∙ 13y ago
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