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Old 12-25-2003, 06:02 AM
87-300E_in_NC's Avatar
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Join Date: Dec 2003
Location: outside of Raleigh, NC
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Question Voltage at coil wires??? 2.6 300E

Voltage on disconnected coil wires with the ignition switched "on"

Would any MB tech know off hand what the voltage on disconnected coil wires with the ignition switched "on" should read?

I have tested mine and only have one wire (out of four individual wires) reading battery voltage at the coil.

Please advise Thanks
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Old 12-25-2003, 10:07 AM
LarryBible
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That's what you should see on any coil ignition system. The + terminal gets battery voltage when the ignition is switched on. The negative terminal gets a grounding signal from the points or whatever switching device is used.

I assume that you have already determined that you have no spark. If you have done no other troubleshooting to this point, pull the distributor cap, have an assistant run the starter and make sure the rotor is turning.

If the rotor is turning, then you know that the problem is electrical. If you have an oscilloscope probe the terminals on the coil while trying to start the engine and see if you are getting a primary signal.

Good luck and Merry Christmas,
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