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Factory radio keeps blowing fuses.

  • 1993 Lexus sc400 keeps blowing the main radio fuse,with the ignition off.The antenna is broken so I disconnected it,still continued to blow the fuse.CD changer stopped working about 5 years ago.Could it be the amp or cd player that's causing the short or what?

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You should bypass the factory cd player. I installed a panasonic cd player in a 1994 gs 300 and it was hell. there are alot of wires that have nothing to do with the radio i believe one or some of those wires may be whats causing your problem try this solution if that doesnt work you may have a serious electrical problem

Posted on Mar 26, 2008

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I am planning on using the amp I have on a low power factory car radio. A low power factory radio output should be somewhere between 6-12 watts rms/channel. I will be using the "High Level" inputs for this. DO NOT connect a radio with a higher output power. If your radio says "High Power", 25W/channel, etc, do not connect to this amp. (exception: you can use the "line out" connectors, if so equipped, See Below). I don't have the connector for the high level input so i don't know what I'll do to hook up to it. I'll probably just run wires out of the amp, in lieu of the connector.

The "Low Level" inputs are for an unamplified, line level signal ("line out" connection of a radio, portable CD player, etc). Do Not connect a greatly amplified signal to these connections.

I don't know much about the "Input Sensitivity" control (pot). I'll be leaving it on "Low" for my initial test.

The grey wires are the right speaker wires and the white wires are the left speaker wires. The grey wire with a black tracer mark is the right speaker positive (+) wire. The white wire with a black tracer is the left speaker positive (+) wire.

The blue/white wire is for attachment to your radio's "Auto Ant" (power antenna) connection (usually a orange wire, I said USUALLY). If you have a power antenna on your car, simply splice into the wire running from your radio to the antenna. This blue/white wire activates a relay in the amp which, in turn, completes the circuit through the yellow (+) power wire (See Below). - Alternative 1: You could run this wire directly to your battery with a switch to turn the amp on. You would need to place an in-line fuse of 2amp. - Alternative 2: You could connect this wire to the accessory fuse in your fuse box. If this is done, again, attach a 2amp in-line fuse for extra protection. (Note: if attached to your fuse box accessory fuse, the amp will be on even if you're not using the radio. You could have a switch here also). These are just suggestions. The most common way to connect the blue/white wire is the "Auto Antenna" wire of your radio.

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Hope this helps !

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1 Answer

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It is quite possible that the outputs were damaged when the wires shorted. In some case the fuse can blow or the protect circuit will trip . If so remove power , remove the short and reconnect. If there is no power check the fuse of the main positive line. If the fuse is intact or if the fuse blows on connection there is a short which must be confirmed. Disconnect the output drive and check to confirm.

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Check the amp turn-on wire. It's a blue/white wire running from the radio to the amp. It's probably label REM at the amp. This wire sends a switched 12 volts from the radio to the amp. It is probably shorting out somewhere between the radio and the amp.

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My car Amp keeps blowing the main fuse, How to find the short?


Hello A4en1, hi, A short circuit need not be burned, the short usually are semiconductors such as ICs and transistors or diodes, I suggest you replace your IC power amplifier.

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Hello prabh_dusanj,

First make sure that the amp is not operating into too low of an impedance. If the load is OK, it's most likely a short in the output transistors.

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I have a dual XIA3145 580 watt amp that keeps blowing fuses


Generally, this indicates that there's at least one shorted output transistor.

Disconnect all speaker wires from the 'amplifier's speaker terminals' and disconnect RCA/signal cables from the amp. If it powers up normally, the speakers/wiring need to be checked. If it still blows the fuses, the amp almost certainly has shorted output transistors and will need to be repaired.

I'd recommend using two 10 amp fuses. The amp will power up with 10 amp fuses if there is no problem. If there is a problem, there's less of a chance of doing more damage by using the 10 amp fuses.

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babin_perry@yahoo.com

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If the fuse only blows after remote voltage is applied, it likely has shorted output transistors.

You should confirm that nothing external is causing this by disconnecting the speaker wires from the amplifier's speaker terminals and disconnecting the RCA cables from the jacks.

What make/model amp is this?

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97 lexus factory nakamichi amp draw


Are you sure that the amp is what is causing the current draw? Try pulling out the amp fuse and radio fuse in your fuse box and see if the battery still dies. But, I would go to a local car audio shop. The company that we used when I worked at the shop was United Radio, you might be able to contact them about a quote if it is shorted. Another option is searching ebay, or a scrap yard. I'm sure there are plenty out there somewhere. Good luck.
-Andrew Hawkins

Apr 10, 2008 | Car Amplifiers

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