fosgate 1998 series power 500.2 amp blowing fuse

[jbrooksgametech]

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

[I Am An Idiot]

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.

[jbrooksgametech]

the amp dosen't have an onboard fuse it blows the fuse from the battery to the amp

[Perry Babin]

He was asking if it blew the fuse before remote voltage was applied.

[jbrooksgametech]

ohh sorry no it only blows the fuse when you turn on the stereo

[Perry Babin]

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?

[jbrooksgametech]

ok i measured them im not getting any that measure zero but i do have a couple that measure rather high for my liking

[Perry Babin]

Try setting the bias pots fully counter-clockwise.

What do you mean when by 'rather high'?

[jbrooksgametech]

like they wouldnt measure on any resistance setting but the 20k ohms and others wouldn't measure on any setting but 200 ohms

[Perry Babin]

Does your meter have a diode check function?