Dumb Newbie Question (Maybe)


Technical information and Q&A applicable to all years and models of Goldwings
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jsthomps
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Dumb Newbie Question (Maybe)

Post by jsthomps »



Why is the starter circuit not fused? If a short was to occur in the starter motor all hell would break loose.





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kwthom
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Re: Dumb Newbie Question (Maybe)

Post by kwthom »

What bike is this???
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jsthomps
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Re: Dumb Newbie Question (Maybe)

Post by jsthomps »

The schematic is for a 1985 GL 1200 I but my 1998 Valkyrie GL 1500 has the same circuit

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OldguyGlen
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Re: Dumb Newbie Question (Maybe)

Post by OldguyGlen »

This type of starter circuit has been commonly used in cars, trucks, and bikes forever. the starter motor draws a huge amount of current, especially at the point of initial movement. It would take a very large fuse. If a catastrophic failure occurs, something melts, insulation burns, battery fails internally, etc. You usually detect (smell) a problem and release the start button immediately, before it blows up. But the start button could fail as well.
Think of it like an airplane... they have all kinds of safety devices, and emergency procedures. But they don't have a protective process to recover and land safely if a wing falls off.

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Andy Cote
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Re: Dumb Newbie Question (Maybe)

Post by Andy Cote »

OldguyGlen wrote:
Thu Nov 12, 2020 3:58 pm
This type of starter circuit has been commonly used in cars, trucks, and bikes forever. the starter motor draws a huge amount of current, especially at the point of initial movement. It would take a very large fuse. If a catastrophic failure occurs, something melts, insulation burns, battery fails internally, etc. You usually detect (smell) a problem and release the start button immediately, before it blows up. But the start button could fail as well.
Funny you should mention this. Decades ago I had a Pontiac with a V8. GM starters had the solenoid right on the starter with a fusible link. I broke a motor mount which allowed the engine to fall way over to one side and the battery hot lead got close enough to make contact with something grounded. Crossmember maybe? Anyway, lots of smoke for a few moments then nothing.
2015 Goldwing, basic black

Previously: GL1200 standard, GL1200 Interstate, GL1500 Goldwing, GL1500 Valkyrie Standard, 2000 Valkyrie Interstate, many other Hondas

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WingAdmin
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Re: Dumb Newbie Question (Maybe)

Post by WingAdmin »

jsthomps wrote:
Thu Nov 12, 2020 12:24 pm
Why is the starter circuit not fused? If a short was to occur in the starter motor all hell would break loose.
Screen Shot 195.JPG
This is the same way it has been done pretty much every vehicle - your car, every motorcycle, airplanes, everything, forever.

Starters can draw hundreds and hundreds of amps when first engaged. This would require a slow-blow fuse capable of handling hundreds of amps, and it would be massive.

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Re: Dumb Newbie Question (Maybe)

Post by WingAdmin »

Incidentally, the weakest point in the starter circuit is the wiring inside the starter itself. If the starter were to fail and short out, the internal wiring (likely the wire connecting the outer terminal to the inner commutator) would melt and burn up. Which is kind of like a fuse.

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Re: Dumb Newbie Question (Maybe)

Post by Solo So Long »

OldguyGlen wrote:
Thu Nov 12, 2020 3:58 pm
Think of it like an airplane... they have all kinds of safety devices, and emergency procedures. But they don't have a protective process to recover and land safely if a wing falls off.
https://brsaerospace.com/

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Re: Dumb Newbie Question (Maybe)

Post by jsthomps »

LOL the parachute is the fuse



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