mercruiser 5.0lx cranks ,no fire

[newtoboat101]

1988 5.0lx mercruiser thunderbolt iv ignition rochester carb, mechanical fuel pump ,engine was running an hour earlier no problems ,went back to start ,delco alarm low pressure sounded ,and stayed on ,turned key to start ,motor turns over ,but does not start ,engine turns alot easier or freer than before ,normally motor would have a little snap to it when it would fire now its turns easier,with no fire ,definitely sounds like some sort of kill switch on or no spark, i have replaced the following before all this happened ,coil , plugs ,wires ,starter ,alternator,distributor cap,rotor,ignition switch ,thermostat,the switch and thermostat were the most recent items replaced only reason i mention thermostat is that i found out i had no thermostat in housing and that was replaced earlier that day ran fine all worked fine shut down went to start up and alarm came on ,but would not start ,could ignition switch got screwed up when alarm came on,when alarm comes on does it pop fuses ,checked all were fine ,want to check with experts before i dive into check electronics with ohm meter or light

 

[Bt Doctur]

,could ignition switch got screwed up when alarm came on No
,when alarm comes on does it pop fuses , The alarm circuit is not supposed to be blowing fuses
Do you have 12v to the + side of the coil? Do you have spark from the coil?

 

[newtoboat101]

Do you have 12v to the + side of the coil? Do you have spark from the coil? wont know til i get to it tonight this all happened last night so all i have been able to do is think about what it could be, and how to attack this problem will be doing checks later today(coil, spark test)

 

[alldodge]

Do you have a man overboard kill switch?

 

[newtoboat101]

no ,alldodge ,glad your checkin in on my post ,i have had good luck with your advice in the past ,will be diving in to thunderbolt ignition tonight ,put on iboat because all i can do is scratch my head right now ,and was hoping someone had similar problem also need to add that when i went to start motor ,turned key to start position and got a clicking noise down near starter solenoid happened 3 times then starter turned motor ,but no start ,batteries are full power, just cranks with no fire ,but the way it sounds i would say its electrical spark type issue

 

[newtoboat101]

ok got engine to fire ,wire on distributor ,i believe was culprit ,seems the connector with white wire (looks like green stripe on white wire ,but not 100% sure)was not properly crimped ,when i moved wire engine fired ,would that wire wire not having 100%connection cause a no start, if not then the mystery continues

 

[alldodge]

Yes if it was not making good contact the coil will not fire

 

[newtoboat101]

thanx then i am confident that was the problem