No spark

[GasCan II]

I have a 1989 M/C 2.5L serial #C388528, and the points are sparking but there is no spark at the plugs.
What should I be looking for ?
Thanks !

 

[alldodge]

Re: No spark

Thanks, sure do appreicate the serial number.
Your getting spark at the coil, next have a look at the cap and rotor. If they look clean, pull the coil wire and see if you get spark (should be blue/white and be able to spark out about 1/2 inch.

If no spark - Check voltage at coil (pos) should be 6V or more with key in run position and 12V while cranking.
If voltage is good - and had no spark at coil, replace coil.

If you had spark at the coil - and you had no spark at plug wire ends, replace plug wires.

Let us know what you found

 

[GasCan II]

Re: No spark

OK I have 12 volts at the + side of the coil and same wile cranking. I am trying to start this motor with out an alternator does that matter ? I just want to hear this motor start up , before putting any $$ in to it .
Thanks

 

[achris]

Re: No spark

As long as the battery is charged, then it doesn't matter if there is no alternator. Have you confirmed you have spark from the coil?

Chris...

 

[GasCan II]

Re: No spark

There is no spark from the coil but the points are sparking, can the coil be bad ??
Thanks

 

[achris]

Re: No spark

There is no spark from the coil but the points are sparking, can the coil be bad ??
Thanks

Most likely.

My preferred method of confirming a coil good or faulty is...
1. Remove all wires from both terminals of the coil.
2. Have a spark plug in a single lead with one end of the lead plugged into the top of the coil and the spark plug on a GOOD ground on the engine block.
3. Connect a short length of wire to the coil -, and another length of wire from the battery positive directly to the coil +.
4. Rapidly tap the wire from the coil - onto the engine block and observe the spark plug. Each time the wire comes off the engine block, the plug should spark.

If you get a good spark with that test, the coil is good. If no spark, coil is bad.....

Chris.....

 

[GasCan II]

Re: No spark

Thank you achris I will try that tomorrow. Right now it is dark here .
Thanks again !

 

[achris]

Re: No spark

Dark is the best time to be testing for sparks...

 

[GasCan II]

Re: No spark

achris;
Thank you very much, your coil test proved the coil was bad. New coil and it starts right up.
Thanks again !