Hi from Norway.
I am into for me a strange behaviour from the ignition system on a Mercruiser 230 V8 using a Thunderbolt 4. The motor is running for some minutes from start up and suddenly the voltage on the system falls from 12.9 volt or even higher when the alternator charge. The motor stops due to the below 12volt or may be the strange current draw over the coil. The coil is called a HEI wich should be a special one for Thunderbolt. I can read 6 to 7 amp on a clamp amp meter at the time the failure cut in. Would a coil without a distrubtor cutted negative feed rise the current draw to this for me high level.
The resistance is low as 1.ohm mostly on coils and this type has a special winding they say. Any advice would be great. Tried to help out my son for 2 weeks now. It could be that the distrubtor or the sealed electronic box that stop pulsing the coil winding and the high current draw is jut normal by a stabil DC on the coil or is the amp reading og 6 to 7 amp a sign of a short in the coil windings after a "heating up time" ? Anyway start up normal at first try every day after all have been shut off over night. The sympthom of what who occur after some minutes is the amperage and following dead engine.
Thank you for any support to help us out.
Norboy
I am into for me a strange behaviour from the ignition system on a Mercruiser 230 V8 using a Thunderbolt 4. The motor is running for some minutes from start up and suddenly the voltage on the system falls from 12.9 volt or even higher when the alternator charge. The motor stops due to the below 12volt or may be the strange current draw over the coil. The coil is called a HEI wich should be a special one for Thunderbolt. I can read 6 to 7 amp on a clamp amp meter at the time the failure cut in. Would a coil without a distrubtor cutted negative feed rise the current draw to this for me high level.
The resistance is low as 1.ohm mostly on coils and this type has a special winding they say. Any advice would be great. Tried to help out my son for 2 weeks now. It could be that the distrubtor or the sealed electronic box that stop pulsing the coil winding and the high current draw is jut normal by a stabil DC on the coil or is the amp reading og 6 to 7 amp a sign of a short in the coil windings after a "heating up time" ? Anyway start up normal at first try every day after all have been shut off over night. The sympthom of what who occur after some minutes is the amperage and following dead engine.
Thank you for any support to help us out.
Norboy