After replacing engine I am not getting any spark from the coil

SLC240

MEMBER
1996 DODGE RAM
225,000 MILES

I replaced the engine and have everything hooked up correctly as far as I can tell. I tried starting the engine but I get no spark from the coil. This is a 5.9 liter magnum engine. I have checked the circuit to the coil and cannot get 12V. I hooked up a small wiring harness between the coil and the connector and checked for voltage and have no voltage, then I tried that while starting and got a flash of 11.93 volts then it dropped off to 0 voltage. This circuit also includes the injectors and I get no pulse for them. I would like to know where this circuit starts and any information about testing this circuit. Also can you point me to a more indepth wiring diagram than in the Haynes manual.

Thanks guys and I'm sure you will need more information from me but this is a starting point.

John

6 Replies

FIXITMR

MECHANIC
9,990 POSTS

Was engine same as 1 removed? Did you switch over components to match computer already in vehicle?

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Tuesday, November 29th, 2011 AT 6:39 PM

SLC240

MEMBER
3 POSTS

Yes, it is the same engine. The only things changed was a small change to the cam but well within the limits of the OEM PCM parameters, a stock OEM replacement distributor and new heads with roller rockers. Other than those items it is completely the same as when I pulled the engine. I thought it might be the distributor but if I'm not getting 12V to the coil it is my assumption that the distributor is not even in play yet.