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Thank you all in advance. I'm new to the forum and my 1977 Powerwagon is my plow and farm truck. We have incredibly weak spark. We've changed out almost the entire ignition system (new distributor, plugs, plug wires, coil, ignition control module, resistor) without much luck. We seem to have the correct voltage going into things but not getting the spark. I have electrical component that sits directly on the firewall, right below the hood, almost dead center- very close to the wipers themselves- that we cannot identify. It is green plastic, and it has three wires into it. It hooks into the ignition control module. Any help in identifying this would be greatly appreciated. Thank you
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May be a ballast. Also I had voltage and week spark before and found a bad ground. Another common issue on W200 and w150 are the amp meter in the instrument cluster. I found a loose ground in the back of the meter it's easy to get to for checking.
 

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