[Rivethead]

I'm reading the install manual for my SL30 and it says that both sides (Nav&Comm) of the radio are protected by a built in fuse, one for each side and of differing values. So for example the manual says the radio has lets say a 7 amp built in fuse on the comm side and should be protected by a 5amp fuse on the down leg. Does that mean that there should be a fuse on the ground side of the radio? I'm just not sure what ?Down Side? means.

 

[Mike S]

Nav is recieve only, will have a lower value fuse.

Comm uses a lot more power when transmitting, thus a higher value fuse.

These internal fuses protect what is in the box.

You want to put in a fuse/CB to protect the wiring going to the box.

Just use the size recommended by the mfg, and you should be fine.

 

[ptrotter]

In this case the "down side" simply means toward the power source. Put the recommended fuse/breaker in the V+ connections to the Nav and Comm power leads.