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Point Type Ignitions with Amplifiers (Power packs)

(Preamps are electronic replacements for points)
A large proportion of the problems with the battery CD units are caused by low battery voltage or bad ground connections. Low voltage symptoms are weak fire or erratic firing of cylinders. Maintenance free batteries are NOT recommended for this application.
WARNING!! Battery cable reversal will cause severe damage to the CD module and rectifier.

NOTE: The Chrysler CD modules are similar to the OMC CD modules with the exception of wire colors. The chart below will assist you as a general guideline:
White/Black stripe
+12V from battery (RF Noise Filter)
+12V from key switch
+ Terminal of ignition coil
OEM Tachometer signal
Points or Preamp Module
- Engine ground
  1. Clean all battery connections and engine grounds.
  2. Make sure the CD module is grounded. Units using rubber shock mounts require a ground wire fastened from the pack to the engine block.
  3. Connect a spark gap tester to the high tension lead coming from the ignition coil and set it to approximately 1/2. If it fires when you crank the engine over, there is a problem in the distributor cap, rotor button or spark plug wires.
  4. Check voltage present on the blue wire at cranking. It MUST be at least 9 volts. if not, the problem is likely in the harness, key switch, starter or battery.
  5. Connect a DC voltmeter to the white/black wire (while it is connected to the distributor) and rotate the engine. There should be some fluctuation in the meter reading. If the reading is high, and fails to move up and down, there is definitely a problem inside the distributor. If the reading is low, disconnect the white/black wire rom the distributor and with the key switch turned on, strike the white/black wire against engine ground. The unit should fire each time. If it does, then the CD module is usually good and the points (or Preamp) require checking. If the CD module fails to fire with this test, then the CD module is usually bad.
  6. Check DVA voltage on the gray wire going to the coil, it should be approximately 200 volts at cranking. If the voltage is right, replace the coil with another coil and retest or use a load resister if another coil is not available. A coil that is shorted internally will give a low reading. In this case replace the coil and retry.
After repairing the engine, check the battery voltage at approximately 3500 RPM, The MAXIMUM allowable voltage reading is 16 volts and the minimum is 12V. Running below l2V or over 16 volts will damage the ignition. Check for loose connections or a bad battery.
Magnapower II Systems
  1. Disconnect the white and blue kill wires from the CD Module and retest. If the engine starts and inns, the key-switch or kill circuit is bad.
  2. Connect a DC voltmeter from the kill wires to engine ground and turn the ignition switch on and off several times. At no time should you see battery voltage on a kill circuit.
  3. Connect a spark gap tester to all cylinders and test with the spark plugs in and out. If the coils will not fire with the spark plugs in, check compression with the spark plugs removed from all cylinders. A blown head gasket on these engines can cause the coils not to fire with the spark plugs installed. This is caused by a hard to explain problem with the triggering circuit.
  4. Crank the engine with the starter and then stop. Check the DVA voltage on terminals Ti and T4. You should read between 170 and 270 volts Positive on terminal Ti and between 170 and 270 volts Negative on terminal T4. (Remember that some DVA adapters are not polarized and will read the same regardless of the polarity). If there is a low reading on one of the terminals, disconnect the white/blue and green/white trigger wires, then retest. If the readings are now correct, one of the trigger modules is bad. A continued low reading may be caused by a bad capacitor. To test, use a couple of jumper wires and swap the green and white capacitor wires going to terminals Ti and T4. If the low reading remains on the same terminal, the CD is bad. If it moves when you move the capacitor wires, the capacitor is shorted.
  5. Check to see if the ignition coils are wired correctly. The #1 coil on a two cylinder and the #1 & 2 cylinder on a four cylinder are wired as NEGATIVE GROUND. The #2 coil on a two cylinder and the #3 & 4 cylinder on a four cylinder are wired as POSITIVE GROUND.
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