fosgate 1998 series power 500.2 amp blowing fuse - diyAudio
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Old 24th November 2008, 02:11 AM   #1
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Default fosgate 1998 series power 500.2 amp blowing fuse

ok so heres my problem i have a 1998 fosgate power 500.2 amp that wont do anything but blow my main battery fuse i am looking for someone who can help me trace the problem down i dont want to scrap the amp its probably one of the best amps i've ever had
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Old 24th November 2008, 07:47 AM   #2
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We need to know if it blows the fuse without the radio turned on. Put a 10 amp fuse in the amp without turning the radio on. Remove it and check it. Let us know what you find out.
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Old 24th November 2008, 09:13 PM   #3
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the amp dosen't have an onboard fuse it blows the fuse from the battery to the amp
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Old 24th November 2008, 09:23 PM   #4
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He was asking if it blew the fuse before remote voltage was applied.
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Old 25th November 2008, 06:35 AM   #5
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ohh sorry no it only blows the fuse when you turn on the stereo
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Old 25th November 2008, 11:21 AM   #6
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The most likely fault is shorted output transistors (transistors marked IRF540 and IRF9540).

On those transistors, measure the resistance between legs 2 and 3 of each individual transistor. Are there any that read near 0 ohms?
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Old 25th November 2008, 07:31 PM   #7
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ok i measured them im not getting any that measure zero but i do have a couple that measure rather high for my liking
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Old 25th November 2008, 07:37 PM   #8
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Try setting the bias pots fully counter-clockwise.

What do you mean when by 'rather high'?
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Old 26th November 2008, 01:39 AM   #9
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like they wouldnt measure on any resistance setting but the 20k ohms and others wouldn't measure on any setting but 200 ohms
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Old 26th November 2008, 01:46 AM   #10
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Does your meter have a diode check function?
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