Electrical Ohm Tips 3 | OhmCheck.com

Useful electrical tips and hints See Ohm tips 1 | 2 | 3

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● When you are checking resistance with a meter, make sure the wire or circuit you are testing is isolated from all other circuits. This means, for example, if you are checking a wire that is spliced into another wire, you would first want to remove the wire to be checked from the splice point.

This way you are checking only that portion of the circuit, and could easily narrow it down. Note: If you do not know how to splice wiring, then leave it connected and find another point to disconnect the circuit.

● When disconnecting wires, always mark your wire with where it was connected to, this way when your done, you don't have to guess where it went.

● Here is a handy chart and instructions for reading and understanding resistors and their color codes. Resistor color chart.

● Diodes. When testing diodes, which allow current to flow only in one direction, you want to set your meter to the diode setting if it has one. You should disconnect at least one side of the diode if it is still in the circuit. First check resistance across the diode, then check again but swap your leads to the opposite side they were on for the first reading.

If you get an open (meter doesn't move) one way, but some kind of reading the other way, then the diode is good. If you get a reading (meter moves) both ways, then the diode is shorted. If you get an open (no movement) both ways, then the diode is open.

● Fuel injectors. Most fuel injectors will have a resistance of approximately 10 to 18 Ohms, check your service manual for exact number. To Ohm, you can leave installed or remove for ease, putting your meter leads on the two terminals, you should get around the same resistance on all your injectors. If not, the odd one is bad.

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