Question about 1987 Dodge Ram 50
There are two places to check resistance. Set the voltmeter to ohms, and pull off all wires on the coil. Measure the resistance between the plus and the neg. terminals on the coil. Second, measure between the coil tower (where plug wire connects) and the negative terminal.
You have to know the specs for your coil, so you will know if your tests are within the specs. Consult a repair manual for your vehicle, or ask at the dealer service department, or maybe the parts person there will know (then again, it's an '87, they'd have to look it up somewhere...).
Your first reading should be low-on the order of 0.8-2 ohms, or maybe 3 ohms at most. The second reading is always pretty high, say 8,000-10,000 ohms, or 8 to 10 kilo ohms. You have to know the specifications for your coil-it would be in a repair manual. If the coil falls within the specs, it is good.
Posted on Dec 31, 2012
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Posted on Jan 02, 2017
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