1985 Dodge Ramcharger ignition system

1985 DODGE RAMCHARGER
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JOSHUASTEWART
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Electrical problem
1985 Dodge Ramcharger V8 Four Wheel Drive Automatic

if i unplus e.c.m. box truck will run.i need a diagram on rewiring the ignition system.it has 4 prong e.c.m. whats the diff. between the 4 and 5 prong e.c.m's.
May 11, 2009 at 9:57 PM
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HMAC300
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a 4 prong ecm has a single ballast resistor while a 5 prong has a dual ballast resistor. The car shold not run with the ecm unplugged. In order to check the control unit you need a volt/ohm meter. you should have 10-12 volts on both sides of ht ecoil if nt there is either a poor connection between teh coil and unit or a bad ground between the unitcase and firewall. If you have normal voltage at teh positive side, but low voltage 6-7.6 volts at the negative terminal then teh there is grounded wirig between coil and unit or a defective unit. It should not need to be rewired if it has never been messed with in the first place. Also it is VERY important that the air gap on the pick up coil in the distributor be set at .008"-.010" this has to be done with a non-magnetic feeler guage.
Jan 26, 2010 at 10:15 AM