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I have a boat with a mercruiser 4.3 thunderbolt. It will not
I have a boat with a mercruiser 4.3 thunderbolt. It will not fire. I have checked spark plugs and they are fine. replaced distributor cap, rotor and coil.… read more
Jason
Jason
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Vocational, Technical or Trade School
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5.0 merc cruiser engine, just clicks when turning key, not
5.0 merc cruiser engine, just clicks when turning key, not loud like a starer, was running before … read more
Tan
Tan
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If a tachometer is going bad will cause erratic starting,
If a tachometer is going bad will cause erratic starting, runs sometimes, dies unexpectedly,sometimes starts right back, don't start at other times, runs great at times, synchronizer will show rpm bal… read more
Charles
Charles
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I have a 1991 mercruiser 200/5.0L 2bbl GM 305 V8 and need
I have a 1991 mercruiser 200/5.0L 2bbl GM 305 V8 and need wiring assistance. Alternator orange wire goes to the starter slave solenoid. At starter, there are 2 red wires, 1 orange wire and 1 pur/red w… read more
Tan
Tan
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Mr. Tan , I have a 2452 Ciera Express. I recently have engine rebuilt. I reassemble eng
Hi Mr. Tan , I have a 2452 Ciera Express. I recently have engine rebuilt. I reassemble engine and wiring as I did 3 times before in the past . The problem I face right now : There is no power (Electri… read more
Tan
Tan
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11,406 satisfied customers
I have a 2001 Mercruiser 5.0 (with carburetor) and Thunderbolt
I have a 2001 Mercruiser 5.0 (with carburetor) and Thunderbolt V ignition. I had a slave solenoid issue; in the past when the boat was not run for a week I would have to tap on the slave solenoid to g… read more
Tan
Tan
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I have a 1987 454 mercruiser (Alpha) with a thunderbolt IV
I have a 1987 454 mercruiser (Alpha) with a thunderbolt IV high energy ignition. I was out on the water and everything was working well until it shut down. I checked the coil and no spark. I changed c… read more
Tan
Tan
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have a issue with a thunderbolt 5 ignition on a 5.0 1999
have a issue with a thunderbolt 5 ignition on a 5.0 1999 started boat was running , died , no spark at plugs , changed sensor in dist no spark, power to coil ok power from module red wht wire ok , it … read more
Tan
Tan
MerCruiser Certified Technician
Certified Marine Technician
11,406 satisfied customers
I have just replaced both 1992 454 engines in my boat and can
I have just replaced both 1992 454 engines in my boat and can not get them to start. They will crank, are getting gas and there is 12 volts to the coils. Have check all sensors but not getting any spa… read more
orcamarine
orcamarine
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Vocational, Technical or Trade Scho
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I have a Mercruiser 502 that was in a inboard/outboard. Im
I have a Mercruiser 502 that was in a inboard/outboard. I'm trying to run it out of the boat on a lift. It has the plug that was used for the dash hook-up, now with nothing connected to it. I can jump… read more
James
James
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Vocational, Technical or Trade Scho
4,094 satisfied customers
Troubleshooting Thunderbolt ignition Steps mention White/Red,
Troubleshooting Thunderbolt ignition: Steps mention White/Red, White/Green wires.... I have two purple wires on the + and two gray wires on the -. I don't understand what the instructions are directin… read more
James
James
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Vocational, Technical or Trade Scho
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i have a 2000 v6 vortec inboard engine, it will not run unless
i have a 2000 v6 vortec inboard engine, it will not run unless you hold the switch in the start position. I replaced switch and safety shut off that has lanyard. I am lost ?… read more
James
James
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Vocational, Technical or Trade Scho
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I have a 1984 Celebirty Boat with a good chevy 350 motor in
I have a 1984 Celebirty Boat with a good chevy 350 motor in it and the floor and stringers are bad. I also have a 1996 Chapparal that has a bad chevy 305 alpha one motor in it. I was wondering on if I… read more
Master Tech
Master Tech
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Vocational, Technical or Trade Scho
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Hi I have a 96 5.0 mercruiser engine. Engine is cranking
Hi I have a 96 5.0 mercruiser engine. Engine is cranking and have no fire. not a fuel problem. distribtor and rotor looks ok. I am leaning toward the coil or electronic module that is attach to the ba… read more
K. Kergan
K. Kergan
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Vocational, Technical or Trade Scho
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I am trying to troubleshoot a thunderbolt iv. I am unable to
I am trying to troubleshoot a thunderbolt iv. I am unable to get 12v at the coil. I can jump directly to the coil and the motor will start but will only turn over without jumper wire. Can you tell me … read more
James
James
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Vocational, Technical or Trade Scho
4,094 satisfied customers
Im looking to replace a busted block on my MerCruiser 5.0
I'm looking to replace a busted block on my MerCruiser 5.0 Inboard, ouboard and don't know what to ask for when advertising for a used replacement… read more
Pappy's Sales and Service
Pappy's Sales and Service
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4.3 Mercruiser ThunderBolt Ignition Slave Solenoid clicks
4.3 Mercruiser: ThunderBolt Ignition Slave Solenoid clicks 1 time when trying to start Have 12 volts at SS have 12 volts at Starter good battery connections Can start by jumping across terminals on st… read more
Mike of Pompano Beach
Mike of Pompano Beach
Charter Fleet Maintenance
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I have a 89 Mercruiser, w/454 engine.(Scarab boat) The boat
I have a 89 Mercruiser, w/454 engine.(Scarab boat) The boat will not start. I have power to the postive side of the coil, but no fire to the plugs. How do I diagnos the ingnition?… read more
Pappy's Sales and Service
Pappy's Sales and Service
Vocational, Technical or Trade Scho
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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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