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post #1 of 13 (permalink) Old 07-05-2015, 11:29 AM Thread Starter
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blowing fuse amp

Hey there, I need some insight and help.

Ive got a Rockford fosgate amp that I keep throwing fuses on. This just started happening recently. Ive had my amp installed now over a year.

Coincidently this started after I had my heated handgrips install at the Harley Dealer.

I had my mechanic check it out, we replaced the fuse under the seat. We've checked all the wiring. And the radio head still has power going to it. Just the speakers stop working. It worked, then blows again. I don't know if my amp is now suddenly over heating. Or is this from the handgrips pulling too much ampage? But Ive not been running the handgrips when this has been happening.....



So ...help... please.

Thanks in advance.
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post #2 of 13 (permalink) Old 07-05-2015, 11:53 AM
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Could be a number of different things. If you replace the fuse, how long does it play before it blows, will it still blow if the bike is sitting parked, how loud are you playing the radio when the fuse blows? A lot of variables. I used to have the PBRs, didn't have much luck with the 300x4, and still wasn't happy with the 300x2, though IMO it was the better of the two. I never had a problem with fuses. What size fuse are you running to the amp?

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post #3 of 13 (permalink) Old 07-05-2015, 12:01 PM Thread Starter
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It doesn't blow when the bike is parked and running. And yes it has blown if I run it too loud... So I am tried keeping it low. Yesterday I tried to get home maybe lasted 15 mins.

I had a 25 in there. I am considering bumping it to a 30.


Thanks for replying.
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post #4 of 13 (permalink) Old 07-05-2015, 12:10 PM Thread Starter
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well shit, I just read this recommended fuse is 50. Let me try that.
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post #5 of 13 (permalink) Old 07-05-2015, 12:10 PM
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I would definitely try a 30, just for the heck of it, do you have the 300x4 or the 300x2, and have you tried adjusting the gain down maybe 1 notch?

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post #6 of 13 (permalink) Old 07-05-2015, 12:15 PM Thread Starter
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I just read the specks on the x2 and x4, they both recommend a 50. I am pretty sure I have the x2. I cant even recall what I bought.


I think I had a 30, but I only had 25s when I tried to replace it. I haven't tried adjusting the gain ... I will though, when my mechanic pops in and we pull the fairing, I will do that.
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post #7 of 13 (permalink) Old 07-05-2015, 12:26 PM
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You said they recommend a 50 amp fuse for the amp but you're only putting a 25 or 30 amp? Is the 50 amp supposed to be IN the amp itself or at the power wire near the battery? Maybe the dealer blew the fuse when the installed the grips and replaced it with whatever he had in his toolbox at the time? If it's calling for a 50 and you're putting in a fuse half of what's required then maybe that's your problem

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post #8 of 13 (permalink) Old 07-05-2015, 12:37 PM Thread Starter
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Its the fuse holder near the battery which I do believe is a dedicated fuse just for the amp. I am not overly mechanically inclined, but I don't mind doing my research. I wont blame it on me being a girl either LOL.

I didn't know they recommended a 50 till I started reading.

I am going to try the 50 and also, check the gain like what was mentioned.

I do appreciate all the help and guidance you both are offering.
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post #9 of 13 (permalink) Old 07-05-2015, 12:59 PM
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The fuse for your amp should be completely separate since it's aftermarket. A good installer would have it close to the battery, probably under the seat or left side cover.

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post #10 of 13 (permalink) Old 07-05-2015, 01:17 PM Thread Starter
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It is, its under the seat. That I can do myself. Im headed to the parts store. I am guessing the drag from the heated grips combined with the not big enough fuse is my problem. Or I hope so.

Again, thanks guys for your input. I knew coming here was the right choice.
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