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Old 12-30-2008, 08:31 PM   #1 (permalink)
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Default a question about starter system wiring

So i was working on some of the wiring on my 2005 Forester, which triggered a question about the starting system wiring...

It's been awhile since some of the wiring has been in place, but from the wiring diagram, the starter's positive lead goes directly to the battery with no fuse in sight.

I'm sure there's some kind of brain freeze going on and therefore an obvious answer here, but isn't running a + lead to the battery without a fuse a no-no? What am I not taking into consideration here?
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Old 12-30-2008, 08:41 PM   #2 (permalink)
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Yes, battery + to the solenoid, which is part of the starter...:)

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Old 12-31-2008, 09:02 AM   #3 (permalink)
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Originally Posted by 2.5x_sleeper View Post
Yes, battery + to the solenoid, which is part of the starter...:)

Bobby..
cool -- but is there a reason that it's not fused from the factory? if that wire gets severed, isn't it +12 hot??

one of the reasons i'm curious about this is because i'm upping the capacity of the car's wiring via the "big three" philosophy, which includes a beefier alternator wire. it's always recommended that this wire be fused at the battery (as is the case with heavy audio system + wiring). That's why i'm a bit miffed about the starter system wire and why it isn't fused..
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Old 12-31-2008, 12:39 PM   #4 (permalink)
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Fuses are used for a few reasons
1. Protect the device at the end of the wire
2. Protect the wire from too much current
3. Protect the vehicle from a fire caused by #2 destroying the wire

Starters draw large and varying amounts of current. In the case of the above reasons:
1. No reason to. It needs no protection
2. If the starter cable is carrying too much current, something else is majorly wrong and you'll already know it (i.e. blown up/dead battery, horrible sound when trying to turn the engine over, etc.)
3. This is really the only reason to have a fuse there. But, due to the hugely varying amounts of current a starter needs at different times, choosing a size that provides adequate protection probably will result in frequent needing to replace the fuse for no reason... Too large of a fuse and there's no point to having one.

With the short length of the wire, relative security of it's size/structure/mounting, there really isn't a need for a fuse there. Some cars do run fuses and or fusible links to the starter, but they cause way more problems then they are worth.
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Old 12-31-2008, 05:04 PM   #5 (permalink)
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I agree that a fusible link would/could be trouble prone. I suspect the reason for no fuse is cost... it would be a honking big fuse & the short distance to the starter, as in not a long run thru the cab, so fewer chances the wire would be damaged...:)

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Old 01-01-2009, 09:54 AM   #6 (permalink)
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^^^ thanks all. Makes sense for the most part, although in an accident situation, a severed starter wire could still be an issue in reason #3 above...

I'm goin to leave it un-fused, and add a fuse to the additional alternator wire :)
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