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I have a 1986 Merc 470 that I
I have a 1986 Merc 470 that I replaced the carb and installed a breakerless ignition. Problem is when on a cold start I can crank the engine for about 3 to 5 seconds and as soon as I let of the key it will pop of and start running. I have experimented with hold they key longer and it won't start until I let off the key. When the engine is warm it starts imediatly. The engine has had a full tune up and runs great otherwise.
I was told by a local mechanic that there is a second positive voltage wire that goes from starter relay to the coil. This wire supplies a full 11 to 12 volts bypassing the resistance wire durring starts. To compensate for the high voltage drop to the coil on cold starts.
I was going to test by jumping a test lead form the positive on the battery to the positive on the coil to see if it starts up on first crank on a cold start.
Any ideas if this is a common issue or a good test?
I have a 1986 Merc 470 that I replaced the carb and installed a breakerless ignition. Problem is when on a cold start I can crank the engine for about 3 to 5 seconds and as soon as I let of the key it will pop of and start running. I have experimented with hold they key longer and it won't start until I let off the key. When the engine is warm it starts imediatly. The engine has had a full tune up and runs great otherwise.
I was told by a local mechanic that there is a second positive voltage wire that goes from starter relay to the coil. This wire supplies a full 11 to 12 volts bypassing the resistance wire durring starts. To compensate for the high voltage drop to the coil on cold starts.
I was going to test by jumping a test lead form the positive on the battery to the positive on the coil to see if it starts up on first crank on a cold start.
Any ideas if this is a common issue or a good test?