Old school Thunderbolt question...420HP
#1
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Old school Thunderbolt question...420HP
Do the old schollignitions on 420 boats use internal or external resister coils?
HAving lots of wierd ignition issues and wondering what coild I am supposed to have??
Or if my issue coulkd be in the wring harness (resistor)??
HAving lots of wierd ignition issues and wondering what coild I am supposed to have??
Or if my issue coulkd be in the wring harness (resistor)??
Last edited by Full Force; 09-04-2012 at 08:00 PM.
#3
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Your boat being a 1985, probably came with a points style ignition. Its possible theres a resistor in the wiring harness. Make sure you have a full 12+ volts at the coil with the TBOLT IV.
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Right, when I bought the Baja it had points, I converted it to TB ignition and always have been having spark issues, but had lots of other issues over the years to deal with and now that I put it all in Cig same issue is there...
12 at the coil? or ACROSS the coil?
if it has resistor where would it be? I used the stock points harness years ago in it, can I remove it?
12 at the coil? or ACROSS the coil?
if it has resistor where would it be? I used the stock points harness years ago in it, can I remove it?
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Odd thing is I did both engines at same time 4 years ago, port always is fine, stbd not, but I look at spark and port spark looks way stronger then stbd...
so if there is a resistor how can one be fine and other not????
so if there is a resistor how can one be fine and other not????
#6
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12v at the positive side of the coil, resistor wire would be in the harness with another wire coming from the "I" terminal on the starter.
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dont overlook your ignition switch itself going bad. That was a common occurence on the old Parasail boats i had over the years.When they get old they can not be making good contact and have the same issues you are describing.
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Right.... same issue..... different boats.... wiring followed engine from Baja to cig..... I put new ignition switches in Baja to check when I had issues there
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Btw if the resistor wire is still in the harness you'll have 5-7 volts key on and 12 while cranking
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I checked lacrosse. Coil once and it had 7 volts.. I did other engine it had 12 how come one one was right and one wring when. Other were points before I changed it?
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