Quote:
Originally Posted by shrew
I think when he says 'Jump Start', he means using jumper cables and a remote battery connected to the existing battery. The exisitng battery shorts the circuit, but the power for the starter is beign drawn from the remote battery through the jumper cables. In that case, the exact same starter is being used. A bad starter would not start no matter how many battery you hooked up to it.
What you describe would be the case when jump starting a car or motorcycle with a standard transmission by pushing it, then putting it into gear and dumping the clutch. This engages the transmission and forces the rolling wheels to turn the engine until it starts itself. That is technically all a starter does anyway. There is no way that I know of to 'jump start' a boat by pushing, pulling, etc and would never try to manualy spin the prop to jump start a boat in this manner (ala the old WW1 biplanes when someone shorts the circuit manual ("CONTACT") then someone else spins the prop.
Just my .02
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jump-start (jmpstärt)
tr.v. jump-start·ed, jump-start·ing, jump-starts
1. To start (the engine of a motor vehicle) by using a booster cable connected to the battery of another vehicle
In no way was I implying you could push start a boat. From where I come from, jump start is the term used for starting a vehicle with another battery. The statement that he had to "boost" even after installing a new battery led me to the possible bad starter scenario.
A starter going bad may require a large current (amps) to turn the starter. The installed battery may not be providing enough current to turn the bad starter and jump starting the motor by electrically connecting another battery in parallel can provide enough current to turn over the bad starter. An unusually high current draw and low free turning speed or cranking speed typically indicates a shorted armature, grounded armature or field coils, or excessive friction within the starter itself (dirty, worn or binding bearings or bushings, a bent armature shaft or contact between the armature and field coils).
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