1977 Dodge Truck 318, no spark: Need Troubleshooting
#1423237
04/21/13 04:11 PM
04/21/13 04:11 PM
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Joined: Jan 2003
Posts: 1,102 Salem, OH (Quaker City Raceway...
GuruRanger
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 1,102
Salem, OH (Quaker City Raceway...
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I have a 1977 Dodge W-200 truck with a 318 automatic. I don't use it very often. Yesterday, I went to use it to pull stumps and haul mulch and it's not getting spark. I've swapped out the following: 1. Ballast Resistor 2. Coil 3. Electronic Control Module 4. Voltage Regulator 5. Starter Relay The truck has a fresh battery and cranks over ok, but it's still not getting spark at the spark plug wires or from the coil to the distributor cap. The only thing I haven't replaced is the pickup in the distributor. Should I start there or am I missing something somewhere else?
Last edited by GuruRanger; 04/21/13 05:17 PM.
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Re: 1977 Dodge Truck 318, no spark: Need Troubleshooting
[Re: GuruRanger]
#1423240
04/21/13 04:26 PM
04/21/13 04:26 PM
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Joined: Dec 2007
Posts: 1,730 elyria, ohio
72gtx4speed
top fuel
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top fuel
Joined: Dec 2007
Posts: 1,730
elyria, ohio
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make sure the key is on.
clem
when i grow up i want to be just like sunroofgtx, god please don't let me grow up.
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Re: 1977 Dodge Truck 318, no spark: Need Troubleshooting
[Re: GuruRanger]
#1423241
04/21/13 04:28 PM
04/21/13 04:28 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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You can throw parts at it until you give up or run out of money.
Or you can do some troubleshooting.
A coil needs only two things to spark, voltage and ground. Once both are hooked up the coil charges up, remove either and it will produce a spark. The factory setup removes the ground to spark the coil
You are either missing the voltage at the coil, or the ground is either always missing or always present.
You can use a spark plug int he coil wire to see if it has spark, you can use a test light to see if there is voltage to the coil +, light should be on if the key is in run or start. You can use a test light on the coil -, it should flash as the engine is cranked over. Any of those conditions fail the test that is where you problems area is.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: 1977 Dodge Truck 318, no spark: Need Troubleshooting
[Re: GuruRanger]
#1423244
04/21/13 05:15 PM
04/21/13 05:15 PM
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Joined: May 2003
Posts: 96,661 On The Boat, On The Lake, Wa. ...
amxautox
Still Retired. Still Posting on Moparts. A Lot.
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Still Retired. Still Posting on Moparts. A Lot.
Joined: May 2003
Posts: 96,661
On The Boat, On The Lake, Wa. ...
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turn on the headlights or the heater fan
wiggle the fusable link between the + post on the battery and the bulkhead connector, and check it for volts thru it with a volt meter.
then go to the bulkhead connector and wiggle the heavy RED wire while watching to see if the lights come on. If not then wiggle the heavy BLACK wire.
If not, then go under the dash and wiggle those 2 wires again.
One might be corroded and not making contact. Then fix that which is bad, maybe by doing the MAD bulkhead connection fix.
Also check the amp gauge to be sure it isn't burned out, including the circuit board around it.
Tom
"Everyone should believe in something; I believe I'll go fishing."
-Henry David Thoreau
Men and fish are alike. They both get into trouble when they open their mouths
author unknown
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Re: 1977 Dodge Truck 318, no spark: Need Troubleshooting
[Re: amxautox]
#1423246
04/21/13 05:35 PM
04/21/13 05:35 PM
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Joined: Nov 2003
Posts: 1,881 Pittsburgh,PA
RTSrunner
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,881
Pittsburgh,PA
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I agree with this.The fact it will not crank with the key switch it is more likely in the wiring harness and not the ignition parts.Have you tried a jumper wire to the coil positive and then jumping your starter relay to see if it starts?So there is no power to the starter relay from the key switch?Nuetral switch possibly,but still does not explain no run.Check the pickup coil air gap and contacts for rust.-RT Quote:
turn on the headlights or the heater fan
wiggle the fusable link between the + post on the battery and the bulkhead connector, and check it for volts thru it with a volt meter. then go to the bulkhead connector and wiggle the heavy RED wire while watching to see if the lights come on. If not then wiggle the heavy BLACK wire.
If not, then go under the dash and wiggle those 2 wires again.
One might be corroded and not making contact. Then fix that which is bad, maybe by doing the MAD bulkhead connection fix.
Also check the amp gauge to be sure it isn't burned out, including the circuit board around it.
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Re: 1977 Dodge Truck 318, no spark: Need Troubleshooting
[Re: RTSrunner]
#1423248
04/21/13 06:01 PM
04/21/13 06:01 PM
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Joined: Jan 2003
Posts: 1,102 Salem, OH (Quaker City Raceway...
GuruRanger
OP
super stock
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OP
super stock
Joined: Jan 2003
Posts: 1,102
Salem, OH (Quaker City Raceway...
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Quote:
...Have you tried a jumper wire to the coil positive and then jumping your starter relay to see if it starts?...-RT
OK, showing my ignorance here, one end of the jumper wire gets hooked to the coil positive, where do you hook the other end of the wire?
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Re: 1977 Dodge Truck 318, no spark: Need Troubleshooting
[Re: GuruRanger]
#1423251
04/21/13 11:10 PM
04/21/13 11:10 PM
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Joined: Nov 2003
Posts: 1,881 Pittsburgh,PA
RTSrunner
top fuel
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top fuel
Joined: Nov 2003
Posts: 1,881
Pittsburgh,PA
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Quote:
Quote:
...Have you tried a jumper wire to the coil positive and then jumping your starter relay to see if it starts?...-RT
OK, showing my ignorance here, one end of the jumper wire gets hooked to the coil positive, where do you hook the other end of the wire?
To the battery positive terminal or other known 12v source.Hot wiring the coil.
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Re: 1977 Dodge Truck 318, no spark: Need Troubleshooting
[Re: GuruRanger]
#1423252
04/21/13 11:27 PM
04/21/13 11:27 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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I'm assuming OE 5 pin ECU/4 terminal ballast. Tighten the 2 3/8" nuts on the ammeter & pull the yellow "ign" wire off of the starter relay to disable the starter (You know the starter works & no need to engage it & run the batt down for these tests plus the noise is a distraction). Have a helper hold the key to "start" & at that point (ign2 crank), 2 pins on the ECU need fire as does the coil positive primary terminal. With the ign key in run (ign1 run), 1 terminal on the ECU needs to be hot as does the same coil primary positive terminal but in "run" power goes to the end of the ballast that has the blue loop on it & on that end on the side that has the brown wire on the other end power flows from the blue wire loop to the brown wire on the end & flows out the other wire that's connected to the brown wire there on that end to the coil positive primary terminal. Need a VOM or a test light. If no fire work back to the bulkhead & seperate the halves & see if the terminals are clean & the firewall half has fire & if not seperate the pull apart electrical connector dangling under the steering column & check continuities. Holler back when you can.
live every 24 hour block of time like it's your last day on earth
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