What size internal fuse for an M50?

Pillow · Post by **Pillow** » Sat Sep 25, 2010 9:37 am

Gosh this seems like an easy question... But the manual is clear as mud on this.

40A was in the amp.

Manual seems to say 30A...?

On music I imagine 30A is fine but want to make sure that it is enough.

It will be driving an MB Quart / AVI hybrid 3 way setup... Not sure of the load, but probably closer to 2 Ohm stereo.

I have been pretty tight lipped here lately... Collecting parts

Thanks!!!

Pillow · Post by **Pillow** » Sat Sep 25, 2010 11:59 am

Yes, I searched. LOL

Pillow · Post by **Pillow** » Sat Sep 25, 2010 4:37 pm

I just stuck a 40A in there. It will be externally fused as well anyway.

I would still love to know what the right fuse rating is?

Post by **mhyde71** » Sat Sep 25, 2010 5:13 pm

i have an m50 thats opened up in shop- would you like me to check that one nd see...i will when i get back in shop tomorrow!

Post by **ttocs** » Sat Sep 25, 2010 6:56 pm

if the manual says 30, I wouldn't recomend going 30% over it with a 40 amp

Pillow · Post by **Pillow** » Sun Sep 26, 2010 7:17 am

See here is the problem... Per the manual.

4 Ohm stereo = 15A
2 Ohm stereo = 30A
2 Ohm stereo, 4 Ohm mono = 35A

Also on the installation wiring diagram the external fuse from the battery input is listed at 40A.

So again I am lost on this issue. The max would be either 35 or 40 for the internal fuse I think...?

Any clarity on this?

Post by **ttocs** » Sun Sep 26, 2010 8:03 am

the fuse at the battery is to protect the wire, not the amp. use the correct size fuse for your application as listed in the manual but 40 amp sounds like it goes on the power wire, not in the amp.

gridracer · Post by **gridracer** » Sun Sep 26, 2010 3:18 pm

I'll open up my M50 later and see what it has for a fuse.

Kurt Wild · Post by **Kurt Wild** » Sun Sep 26, 2010 11:04 pm

My M50 has a 40 amp fuse inside. Cant be sure if its the original but 40 amps sounds right to me,

Pillow · Post by **Pillow** » Sun Oct 03, 2010 7:26 pm

The second M50 I opened had a 40A in it as well!

Now both of the M50s are recapped

Both were in need. One was semi-clean, the other needed a good clean up.

I think we can conclude that the M50 did in fact come with 40A fuses.

Sadly the fuses pulled out did not seem to be PG branded fuses! Maybe they were added to the product line later?

gridracer · Post by **gridracer** » Sun Oct 03, 2010 10:42 pm

I opned mine and it was a 40 also.