View Full Version : Alternator wire upgrade

08-22-2007, 12:34 PM
Has anyone done this??? Is it needed??? I could pull around 100 amps for the JL M6450 (60 amps) and M4300 (40 amps) amplifiers in my boat. I have 4 gauge power leads directly to the battery with a 100 amp main breaker just short of the battery terminal.

From JL installation directions for M4300 amp:

Many vessels employ small (10 AWG - 6 AWG)
wire to connect the alternatorís positive
connection to the battery. To prevent voltage
drops, this wire should be upgraded to 4 AWG
when installing amplifier systems with main
fuse ratings above 60A.



08-22-2007, 02:26 PM
Is the wire to upgrade easily indentified???

88 PS190
08-22-2007, 02:39 PM
This is just a standard wiring project.

Its the B+ line from the alternator, look at yours to find it.

If you choose to do it you should select wire designed for marine use, it has alot of strands and is very flexible.
Tinned wire is the good stuff, waterproof all connections that you make with shrink wrap.

I don't know if its needed or not, my boat doesn't even have a radio, so I've not worried about it.