Re: 1998 Onan MicroLite 4000 Weak SPARK
Sounds like symptoms of low battery voltage while cranking.
Or more properly, low voltage to the engine while cranking.
Could be that the starter is drawing high current too.
Test the batteries and all of the main connections.
Test the voltage AT the starter when cranking versus the voltage at the battery to see if you have excess loss due to a bad connection.
If a jump to another good battery makes the cranking speed perk up and then it starts.....or tries to.....it's a good bet that you have a supply voltage problem. If you do that, be VERY careful about polarity and do NOT have the other vehicle running.
P.S. Unless you are dumping liquid fuel into the cylinder, it won't "put out the spark".
Or more properly, low voltage to the engine while cranking.
Could be that the starter is drawing high current too.
Test the batteries and all of the main connections.
Test the voltage AT the starter when cranking versus the voltage at the battery to see if you have excess loss due to a bad connection.
If a jump to another good battery makes the cranking speed perk up and then it starts.....or tries to.....it's a good bet that you have a supply voltage problem. If you do that, be VERY careful about polarity and do NOT have the other vehicle running.
P.S. Unless you are dumping liquid fuel into the cylinder, it won't "put out the spark".
