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I am brand new to working on boats and engines but I am
I am brand new to working on boats and engines but I am making progress. I have mercury v8 260 and I am having trouble getting spark I have replaced the starter/ignition coil/alternator/dist cap & rot… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
Need to replace a Thunderbolt IV ignition box. Engine won,t
Engine won,t start and I have looked at everything else and this item is connected to the distributor. Distributor appears to be in good shape. … read more
Jason
Jason
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Vocational, Technical or Trade School
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Have a 1989 4.3 merc with thunderbolt iv new motor just
Have a 1989 4.3 merc with thunderbolt iv new motor just installed. Got it fired up but bogged down at higher rpm. Check the timing out it 8 deg before tdc. Won't run now. Any thoughts … read more
Jason
Jason
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Vocational, Technical or Trade School
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On mercury thunderbolt IV ignition if we have set the
on mercury thunderbolt IV ignition if we have set the distributor in place and we have found tdc do we have to follow the cap number or can we do this like a standard distributor and arrange wires bas… read more
Tan
Tan
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Not getting any spark from the coil. I replaced the coil,
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Trying to wire in a interupter switch to a automotive
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Jason
Jason
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My mercruiser 5.7l rebuilt 350 is burning out the electrodes
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Jason
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I have a 1995 5.0L mercruiser with TBIV ignition. I recently
I have a 1995 5.0L mercruiser with TBIV ignition. I recently changed cap, rotor, wires, plug and a leaking coil. Everything runs good except once I get out for 20-30 minutes and fully warm the engine … read more
Tan
Tan
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WHERE IS THE IGNITION MODULE ON A 1986 CHRIS CRAFT SCORPION
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Jason
Jason
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I have a mercruiser 350 mag mpi horizon, just put a new
I have a mercruiser 350 mag mpi horizon, just put a new motor in and customer wants to switch from thunderbolt iv ignition to delco voyager est ignition. Installed est ignition, engine won't run. What… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
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Mercruiser thunderbolt v ignition module part # ***** 1251-1......
Mercruiser thunderbolt v ignition module part # ***** 1251-1...... Where do I buy a new one of these, how do I test the existing one, should I replace coil too. Basically after engine is warm, rpm's d… read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,504 satisfied customers
Tan I have another question for you its pertaining to my distributor.
Tan I have another question for you its pertaining to my distributor. On the 350 Mercruiser I had originally it had an external coil, but the new one I have purchased does not have the coil I believe … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,504 satisfied customers
Have a 1994 Baja , Mercruiser 4.3 thunderbolt ignition , Have
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Jason
Jason
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I have a 260 mercruiser 5.7 that has been recently overhauled
I have a 260 mercruiser 5.7 that has been recently overhauled and i am now having problems with the ignition. The motor turns over but does not start, safety switch on shift indicator works, coil work… read more
Jason
Jason
Marine Mechanic
Vocational, Technical or Trade School
18,955 satisfied customers
1988 Mercruiser 5.7 260 carb. Alpha outdrive. No fire, held
1988 Mercruiser 5.7 260 carb. Alpha outdrive. No fire, held coil wire close to ground one time and seen one big spark when we cut the key on, but when spinning starter nothing. Test light shows 12 vol… read more
Jason
Jason
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Vocational, Technical or Trade School
18,955 satisfied customers
hi i have a mercruiser 4.3l 1990 175hp with thunderbolt iv
hi i have a mercruiser 4.3l 1990 175hp with thunderbolt iv and mercarb, it was parked for 1.5yr and i tried to start but nothing happpened, i replaced sparkplugs, distribuitor cap, rotor, starter, new… read more
K. Kergan
K. Kergan
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I have a 1993 Celebrity. It had a 5.0 Mercruiser and last
I have a 1993 Celebrity. It had a 5.0 Mercruiser and last year the previous owner installed a 5.7 Mercruiser with a Thunderbolt IV Ignition system with a coil and points. I had problems with last year… read more
Jason
Jason
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Vocational, Technical or Trade School
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Hello, I am repairing a 1988 mercruiser MCM 7.4 liter engine
Hello, I am repairing a 1988 mercruiser MCM 7.4 liter engine equiped witha thunderbolt IV ignition and would like to know if there is a correct procedure to time the motor due to the type of ignition.… read more
mercmastertech
mercmastertech
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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