Upgrade alternator/dogbone fuse


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dnt13
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Location: Kelowna, BC Canada
Motorcycle: 2000 GL1500 SE

Upgrade alternator/dogbone fuse

Post by dnt13 » Fri Sep 20, 2019 12:57 pm



I’m installing a DB Eectric 90 amp alternator after the stock alt failed on my 2000 SE. No installation instructions came with the new alt but it looks fairly straight forward and I’ve watched a couple YouTube vids of the process. Question: Is it necessary to add another 55 amp link to the dogbone fuse beside the battery? Apparently Compufire instructions include this because the new alt is 90 amps; however, I’ve also read that the dogbone fuse is there to protect the bike’s wiring and electrical systems from excessive current >55 amps so to boost that up to 110 amps by adding another fuse link might NOT be a good thing. I’m handy but not a mechanic nor vehicle electrical expert. Comments?



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bellboy40
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Re: Upgrade alternator/dogbone fuse

Post by bellboy40 » Fri Sep 20, 2019 1:41 pm

I wouldn't put another fuse in there. It will be fine with just the stock fuse setup. You don't want any burned up wiring.

dnt13
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Re: Upgrade alternator/dogbone fuse

Post by dnt13 » Fri Sep 20, 2019 4:26 pm

This looks like a resistor or capacitor of some sort - do I need to reinstall it with the new 90 amp alternator?

GL1500 alternator resistor?
GL1500 alternator resistor?


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CrystalPistol
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Re: Upgrade alternator/dogbone fuse

Post by CrystalPistol » Fri Sep 20, 2019 5:08 pm

dnt13 wrote:
Fri Sep 20, 2019 4:26 pm
This looks like a resistor or capacitor of some sort - do I need to reinstall it with the new 90 amp alternator?CAFF0746-A827-4EF4-A021-C86298A1DADC.jpeg
Not with the Comp-u-Fire, but I have no idea with the DB Electrical unit. Is it a modded stock alternator or ???

As to a extra 55 amp fuse parallel but spaced away from current one (use washers), mine is like that. All the bike's circuits are protected with their own fuses. I have considered a 70 amp circuit breaker. If you aren't in need of the extra juice, it'll work fine with just the one 55 amp fuse but if you add extra accessories (lights, heated gear, trailer with lots of lights, etc) and total draw exceeds 55 amp, it'll blow.

Here is a link
https://www.dbelectrical.com/products/a ... 0-amp.html
Send them an Email, maybe they'll reply? Or call them?
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How else may I contact you?

You may email us at sales@dbelectrical.com. We are here to help.
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AZgl1800
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Re: Upgrade alternator/dogbone fuse

Post by AZgl1800 » Fri Sep 20, 2019 6:10 pm

Lots of misconceptions about fusing.

That fuse is to protect the bike's wiring, not the Alternator.

Alternators will only output as much current as is needed to raise the charging system voltage to ~14.3ish

if that takes 10 amps, that is all it will put out, no matter that DB Electrical's alternator can source up to 90 amps.....

I seriously doubt, that there is any motorcycle that needs a full 90 amps of charging current available.... the exception will be those bikes that are so gawdy with extra lights for parades, etc.
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ct1500
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Re: Upgrade alternator/dogbone fuse

Post by ct1500 » Sun Sep 22, 2019 11:10 am

dnt13 wrote:
Fri Sep 20, 2019 12:57 pm
I’m installing a DB Eectric 90 amp alternator after the stock alt failed on my 2000 SE. No installation instructions came with the new alt but it looks fairly straight forward and I’ve watched a couple YouTube vids of the process. Question: Is it necessary to add another 55 amp link to the dogbone fuse beside the battery? Apparently Compufire instructions include this because the new alt is 90 amps; however, I’ve also read that the dogbone fuse is there to protect the bike’s wiring and electrical systems from excessive current >55 amps so to boost that up to 110 amps by adding another fuse link might NOT be a good thing. I’m handy but not a mechanic nor vehicle electrical expert. Comments?
Compufire is the only alternator that advertises 60A of current available at idle RPM. All current generated by the alternator on its way to the battery will pass through this 55A fuse. There are only a couple real world instances where the amperage provided by the alternator could breech the dogbone fuse long enough to fry it, no concern whatsoever using the OEM 40A alternator. This would be to jump start another machine or the extended use of reverse gear more so with increased RPM. The dogbone fuse will allow short duration current draws well in excess of the 55A rating. Compufire did their homework to cover most scenarios except for the wire gauge size from alternator to battery. :geek:
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Re: Upgrade alternator/dogbone fuse

Post by WingAdmin » Mon Sep 23, 2019 2:52 pm

That capacitor is likely a noise filter. If you have a CB, you should transplant the noise filter from the old alternator to the new one, or else you'll find your CB is no longer usable due to noise.



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