Originally Posted by
SamMule
A 30A fuse near the power supply is not pointless.
The small fuse for the MFD will blow first in the event of a short circuit (between the fuse and MFD). This will however, leave an available 12v up to that point. If the positive wire is shorted to ground somewhere before the small fuse for the MFD, the 30A fuse near the power supply will blow. This will prevent your power supply wire from melting and causing a potential fire.
NEVER run anything directly from the battery without a fuse very near the + post.
If you only want to run one fuse, put it as close to the battery + as possible. I wouldn't recommend direct wire, as this leaves you without a switch.
My recommendation: Run a nice heavy 8-10ga wire from your battery to a switch (fuse near battery of course)
Then plug your unit/GLS10 power supplies to the switch with their fuses intact.