I ordered some marine switches from Boatfix today.
The salesman said that ANY exposed terminals that are positive and under water need to be sealed or else things will short out.( battery terminals, starter terminals, everything)

I've driven deep water before ( Fordyce can be 4') and never went through all this trouble before. I know that at least the starter motor cable was under water.

So, is this b.s. or what?

Thanks

So, is this b.s. or what?

Yes and No. In theory (and a perfect world for that matter) you should waterproof the entire positive side of your electrical system. This would also include most of the sensors on your vehicle since they tend to be charged at all times and short to ground when open. This would be extremely important if the current was AC, but since most vehicle run DC this isn't all that important. DC doesn't flow through water very well because all the ions that conduct the charge tend to gather around the leads and create a capacitance system. The risk for a short is greatest when the water first hits the electrical system. So if you mostly drive through fresh water you are okay since there isn't a whole lot of salt in it, but if you like to drive through the ocean (like in a boat) you may need to waterproof everything just because all the salt may short the system. Does that answer your question?

Thanks Suprdlux, the drive won't be in the ocean and sence it will only be for a short time, I'm not going to seal the whole positive side.

I just learned something new today. Thanks