Menu
Forum
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Car Audio Discussion
General Car Audio
Car Audio Build Logs
Car Audio Equipment
Subwoofers
Speakers
Amplifiers
Head Units
Car Audio Help
Wiring, Electrical and Installation
Enclosure Design & Construction
Car Audio Classifieds
Car Audio Classifieds
Car Audio Wanted
Classifieds Member Feedback
Gallery
New media
New comments
Search media
SHOP
Shop Head Units
Shop Amplifiers
Shop Speakers
Shop Subwoofers
Shop eBay Car Audio
Test
Forum
Search
Search titles only
Search titles only
Log in / Join
Search
Search titles only
Search titles only
What's new
New posts
Live Activity
Search forums
Members
Registered members
Classifieds Member Feedback
Menu
Reply to thread
Forum
Car Audio Help
Wiring, Electrical & Installation
AMP fuse keeps on blowing
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="Deiimos" data-source="post: 8787232" data-attributes="member: 682903"><p>If the fuse in the amp blows as soon as you put it in, there’s two possibilities. The mosfet transistor(s) are bad, very common, or the reverse polarity protection diode shorted (if it has one). Both mean amp needs repair. Most proper 12v electronics have a diode installed over the power inputs that clamps down the voltage and creates a high current if you hook the wires up backwards, which then blows the fuses to try and save the device from major damage. This diode often stays shorted and needs to be replaced, or removed, meaning it did its job, but died doing it. Sometimes it saves the device, often it doesn’t. You can cut it out with some wire cutters if it has one and see if it helps, but only if the amp is going to be thrown away. Which depends on brand / model as you can sell blown amps to recoup some money if they are decent.</p><p></p><p>My older / second car sat for like 5 years and I had to move quickly and needed it moved, aside from the massive oil leak, and fuel leak, I accidentally connected the jumper cables backwards at night. Of course amp fuses blew, but worked once replaced, so yeah the diode can sometimes be the culprit. I use to do CB radio repair and this was a common fault from people wiring them backwards, of course it often fried audio chips and other transistors a lot of the time too, edit: and that was usually when people installed bigger fuses, or were teamnofuse. <img class="smilie smilie--emoji" loading="lazy" alt="😅" title="😅" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f605.png" /></p><p></p><p>The short answer is, if it blows the fuses as soon as it’s installed, the amp needs repair of some sort.</p></blockquote><p></p>
[QUOTE="Deiimos, post: 8787232, member: 682903"] If the fuse in the amp blows as soon as you put it in, there’s two possibilities. The mosfet transistor(s) are bad, very common, or the reverse polarity protection diode shorted (if it has one). Both mean amp needs repair. Most proper 12v electronics have a diode installed over the power inputs that clamps down the voltage and creates a high current if you hook the wires up backwards, which then blows the fuses to try and save the device from major damage. This diode often stays shorted and needs to be replaced, or removed, meaning it did its job, but died doing it. Sometimes it saves the device, often it doesn’t. You can cut it out with some wire cutters if it has one and see if it helps, but only if the amp is going to be thrown away. Which depends on brand / model as you can sell blown amps to recoup some money if they are decent. My older / second car sat for like 5 years and I had to move quickly and needed it moved, aside from the massive oil leak, and fuel leak, I accidentally connected the jumper cables backwards at night. Of course amp fuses blew, but worked once replaced, so yeah the diode can sometimes be the culprit. I use to do CB radio repair and this was a common fault from people wiring them backwards, of course it often fried audio chips and other transistors a lot of the time too, edit: and that was usually when people installed bigger fuses, or were teamnofuse. 😅 The short answer is, if it blows the fuses as soon as it’s installed, the amp needs repair of some sort. [/QUOTE]
Insert quotes…
Verification
Post reply
Forum
Car Audio Help
Wiring, Electrical & Installation
AMP fuse keeps on blowing
Top
Menu
Home
Refresh