3A to 10A fuse? - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 7 Old 02-09-2018, 06:18 PM Thread Starter
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3A to 10A fuse?

The phone plug on my bike was replaced with a dual USB plug. It has 2.5A to one socket, and 2A to the second. I noticed yesterday that the 3A fuse was blown, and this is likely because the device I plugged into it pulled more than 3A.

If I switch it to a 10A fuse, is this going to immediately melt all the wiring in my harness and cause a nuclear detonation? Maybe I can find a 4.5A fuse, would that be better?
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post #2 of 7 Old 02-09-2018, 06:33 PM
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It mostly depends on what gauge wire is used in the circuit, and how long the wiring is. There are ampacity charts on line that'll tell you how many amps a certain gauge wire can handle over how many feet of wiring. I know that's kind of vague, but I don't know what size wiring is in the circuit, so anything I said would be pretty much an uninformed guess.

Here's a chart that might help: https://www.engineeringtoolbox.com/a...uge-d_730.html

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post #3 of 7 Old 02-09-2018, 06:49 PM Thread Starter
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Originally Posted by RCinNC View Post
It mostly depends on what gauge wire is used in the circuit, and how long the wiring is. There are ampacity charts on line that'll tell you how many amps a certain gauge wire can handle over how many feet of wiring. I know that's kind of vague, but I don't know what size wiring is in the circuit, so anything I said would be pretty much an uninformed guess.

Here's a chart that might help: https://www.engineeringtoolbox.com/a...uge-d_730.html
Thanks. I found another post that said it would be OK to put a 5A fuse in instead of the 3A, so I ordered some of these low profile fuses. Hopefully that works out OK.
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post #4 of 7 Old 02-09-2018, 07:04 PM
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You should probably check and make sure you don't have a short in one of your USB outlets. If the outlet itself is the problem, and not the device you plugged into it, then putting a 5 amp fuse in there instead of a 3 amp is just going to allow the wiring to get that much hotter when the the outlet short circuits. If it is a short, a 5 amp fuse will allow the wiring in the circuit to cook for just that much longer until the fuse blows.

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post #5 of 7 Old 02-09-2018, 07:58 PM Thread Starter
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Originally Posted by RCinNC View Post
You should probably check and make sure you don't have a short in one of your USB outlets. If the outlet itself is the problem, and not the device you plugged into it, then putting a 5 amp fuse in there instead of a 3 amp is just going to allow the wiring to get that much hotter when the the outlet short circuits. If it is a short, a 5 amp fuse will allow the wiring in the circuit to cook for just that much longer until the fuse blows.
Yes, testing that now. It was my InReach Sat Tracker that was plugged into it, but I may have plugged something else in there too at one point, I also wonder if a bit of water might have migrated into the plug somewhere, I ride in rain a lot. Wiring to Tracker seems fine.
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post #6 of 7 Old 02-10-2018, 12:37 AM
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That wiring will take a comfortable 6 amps. I've been in the fuse box wiring and the back of the plug. I think Suzuki have been ultra cautious. I'm running my heated grips @ 5amps with 7.5 amp fuse. I shorted it out and no cooked wiring, it is probably good for 10 amps. My TomTom takes a good 2 amps, with something else plugged in itcould easily overload a 3amp fuse. Get some ACF50, it keeps things insulated and running sweet and stops the corrosion.

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Last edited by philthunder; 02-10-2018 at 12:41 AM.
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post #7 of 7 Old 02-10-2018, 08:07 AM
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2.5A + 2A @ 5v = 22.5 Watts. Assuming its a good quality outlet and 85% efficiency, then it draws 26.5Watts / 13. 8V = 2Amps.

The existing fuse should be fine for that usb outlet. Either the outlet is shorted or it's very inefficient. As mentioned above, using a higher rated fuse could mask a bigger problem. Test the wiring and outlet before the changing fuses. Many multimeters have a dc amp measurement feature. Along with the wire gauge and length, the number and types of connections must also be considered when selecting fuses as each component drops voltage and increases current.

Inreach will draw between 0.5A and 2.0A @ 5V, so that should not be an issue.

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Last edited by marcham; 02-10-2018 at 09:54 AM.
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