]]Anyone ever see an ignition control module look like this? It looks as though it overheated. It still works! I ordered a replacement. There was a ground wire from the battery attached to one of the screws that holds the module in place... that didn't seem right to me.
wow.. the POTTING mix melted...red wire.. from ignition switch.. RUN. also goes to coil positive before it gets to the module. white wire from starter relay I terminal.. 10 degree crank retard when powered by solenoid. Green wire to coil negative. black wire.. ground from this module to the distributor housing via grommet hold down screw.. important connectionpurple and orange are signal wires from the pickup coil...want to learn how to test this system... TEST LIGHT PROBE into the COIL positive connection (red wire).. ground the test clip... turn key ON.. turn key to crank engine.. return key to ON position.. turn off..you should have voltage to the coil positive once you reach ON and not turning off until you turn it to the OFF position...white wire should have power while cranking.. with a digital volt meter.. set to 2K ohms.. 2,000 ohms. orange and purple wire into distributor connector.. around 980 ohms... 500 to 1,500 ohms is expected.. before disconnecting.. change meter to 2 volts AC voltage. spin distributor shaft or crank engine.. you need to see close to 1.0 volts AC. if you don't.. and you pass the resistance test.. replace the reluctor on the distributor shaft.. they loose the ability to retain magnetism.. and will not create enough signal to cause the power transistor in the module to turn on .. if it won't turn on.. it cannot turn off and the coil will never discharge.. these are the basic tests for duraspark.. mount the new module next to the old one.. so you can switch back and forth..
hint.. if it had completely burned out.. you could have carefully unsoldered the wiring from the circuit board.. leaving it in the grommet..remove the circuit board.. install a 4 pin GM module.. with the back side screwed against the inside of the aluminum zinc housing.. with a dab of dielectric tune up grease to allow thermal transfer from the back of the HEI module to the housing.and hook up the RED wire to the B. with a condenser also thats grounded to the housing... the green wire to the C.. black wire to the module hold down screws..orange wire to the W terminal.purple wire to the G terminal..
oh.. the replacement module will need to have the BLUE STRAIN RELIEF..there are various colors that work with slightly different types of ignition..black, red, blue, green, brown, yellow, yellow with 2 strain reliefs.. white..
Wow, Thanks!! I'll go through the wiring and make sure it's correct. Thanks for the info!!!David