Truck Repair: dodge v10 wont start, dodge v10, jumper wires

Question
QUESTION: New ECM on 1995 dodge 2500 v10 4 wheel drive pickup.  Fired one time and then engine just turns over.  Disconnected ground from battery for 10 minutes and then reconnected.  Engine turns over but no attempt to run.  Replaced ECM because when you closed the hood engine would stop.  Jarring ECM would cause engine to cut off.  Moving wires did not.

ANSWER: Hi Robert,
find the ecm relay (under the hood?),pull the relay out and verify that there is primary power and ground (85,86), and secondary power (either 30 or 87)  check with key on. If these check out wiggle and tug on the wires and harnes and see if you lose anything. If no primary power look for a blown fuse first then fabricate jumper wires with appropriate spade connectors to plug into relay. plug these connectors into 85 and 86 on the relay run your jumper wires to the battery (try not to make fireworks). verify continuity with an ohm meter between pins 30 and 87 on the relay (secondary curcuit) (don't touch your ohm meter leads to the powered side of the curcuit! - pins 85,86) if no continuity-replace the relay. If there was no problem found here then you have proven "most likely" there is power going to the ecm. Now you need to prove there is sufficient ground to the ecm...for which you will need a wiring schematic. once you have proven there is ground at the ecm. then check if there is spark when you turn the engine over. if no spark then you may have to find some information on diagnosing the ICM (ignition control module)....same as with the ecm....verifying power and ground. Also, do you hear the fuel pump run when you turn the key on?

sorry if you already know this, but: every engine needs three basic things to run: Fuel, Heat, Oxygen. When there is a no start condition one of these items are missing. Prove systematicaly that each item is present. Heat = spark and cylinder compression, Fuel = ensure fuel is going into each cylinder at the right time (engine position sensor, injectors firing, fuel rail pressure) Oxygen = air filter, ducting. If you break it down into these three things it sometimes makes it easier to pin point the problem.

Hope I didn't ramble on too much,

Matt

---------- FOLLOW-UP ----------

QUESTION: I did check ecm relay as you suggested.  everything ok.  any idea where I can get a wiring diagram?  Thanks for your help!

Answer
try buying a haynes manual or a chilton manual...walmart, canadian tire (if you're in canada), any auto parts store should have a $30 manual. You will need to follow specific procedures for diagnosing electronic components. Also go to where you bought your ecm from and ask them if they can print off a schematic of the ignition control module harness. Word of advice: NEVER test continuity or try to read Ohms through a computer or module unless the manual tells you to. Ohm meters apply a small current to take their reading and sending this current through a computer can seriously harm it!! You definatly need to get some specs and testing procedures so go buy a manual.

Good luck!!

Matt