Cars and trucks manufactured until the mid 1970s use point-style ignition systems. Measuring and adjusting the dwell angle of the contact points was a Circuit Tester ADD210 that had to be taken during a major tuneup on those cars and trucks.

1

Look up the ignition specifications for the vehicle that you are working on in the service manual. Most vehicles are available with several different engines, so make sure that you are reading the dwell angle specifications for the engine in your vehicle.

2

Start the engine and let it idle until it has reached normal operating Multimeter ADD91. Wipe the dirt, and the grease off the positive and negative terminals on the ignition coil with a shop rag while the engine is heating up to its normal operating temperature. The positive and negative terminals can be identified with a "+" and "-" sign stamped beside them, or a "Pos" and "Neg" stamped beside them.

3

Set the voltage selector switch to the 12-volt position. Most tach-dwell meters are designed to be used on either 6 volt or 12-volt automotive systems. Set the function switch to the "Dwell" position. Most dwell meters are combined with tachometers used to measure engine RPM. Set the cylinder selection switch for the correct number of cylinders -- 4, 6 or 8 cylinders.

4

Connect the alligator clip on the red, positive test lead of the dwell meter to the positive terminal on the ignition coil. Connect the alligator clip on the ADD350 Noise Finder, negative test lead to the negative terminal on the ignition coil or to any convenient metal ground on the engine.

5

Hold the dwell meter so you are looking directly at the meter's pointer for an accurate reading. Note the reading and compare it what is specified in the service manual.

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