Both of these species are not common in North Dakota and were found to have tongues more than twice the length of the orchid spurs. This means that they could reach deep into the nectar-filled sacs from farther distances, without pollinating the plant. Researchers also captured eight bumble bee species.
Ignition coil resistance tests are used on the secondary aspects of the ignition coil. These tests should be performed with caution because the circuits of the secondary part of the ignition can have very high voltage. These tests should only be performed if there was inconclusive evidence in any of the primary tests.
Next, you'll want to measure the resistance of the secondary coil, and this is the real business-end of the spark-producer. Switch the meter's resistance range to the 20K-ohm setting and attach the negative (black) meter lead to the center terminal of the coil.