Question about Boston Acoustics GT-42 Car Audio Amplifier

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Safe light boston gt 20 amp

Amp was working fine then shut off all the sudden, fuses in the amp and in the care are all fine,

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  • 152 Answers

First,check the output functions of your radio.

Then test the power lead for 12+ volts and ground at the amp, also be sure the "turn-on/remote power" lead from the radio is supplying 12+ volts when the radio is turned on.
Good luck... 

Posted on Feb 23, 2009

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Boston Acoustics Recepter Radio HD stopped working - no power. The power supply is fine. is there a fuse in the radio?


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it is overheating. run larger power cables, make sure it isn't being covered up by anything.

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its not grounded properly or the subs are not properly wired so make sure you ground wire is screwed to metal not a painted part of the car second check your sub wiring and make sure the subs are not wired at 1ohm if your amp is not 1ohm stable.

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yes you have a internal fault of the amp. the circuit that puts it into safe mode is bad and that is a very small chip on the board know as a op amp. needs to be repaired.

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What size fuse goes in position #4? What are


From the Jeep TJ Wrangler 2004 - Owners Manual (Section 7, Page 255):
Fuse 4 -->> 10 Amp Red -->> Door Switch Defeat
Fuse 16 -->> 10 Amp Red -->> Headlamp Aim (Export only)
Fuse 20 -->> 20 Amp Yellow -->> Transmission: Manual - Clutch Interlock switch by-pass Automatic - Ignition Starter Circuit

I really hope helps with this (remember rated this help). Good luck.

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2 Answers

Sudden shut down.


Your in luck. With nothing working it's your fuse (20 amp). If the light was still working or anything else, it most likely would not be worth repairing. The fuse looks like one of the old round car fuses but it is not. It's a special 20 amp fuse made for micro waves out of ceramic. You can order them over the internet. One site is www.partselect.com. This is a part number for one that cost $3.84 PS2163369. You can use this number or if you can find you model number and enter it on the site. You can buy it with a credit card from them

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Any sub can be blown in 30sec if given bad clipped power, so just measure them with a multimeter and see if the coils still have resistance. Throw away the test light and only use a multimeter.

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1 Answer

Safe light on??


Most of the time in my experience when that happens the amp usually has a fried circuit . make sure no wires are touching or grounding out. Also make sure both the 12 volt constant and remote both have power still. And a good, short ground is a vital key to a proper audio system.

Dec 03, 2008 | Boston Acoustics GT-42 Car Audio Amplifier

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