Grounding fuel tank

[jsakat1]

I have to replace my fuel tank on my 170 Striper.  The usual pitting under the foam protection straps.

I've noticed two wires connected to the ground tab in the tank, one goes to the fill fitting and the other one is broken no signs as where it goes.

Can anyone tell me where this other wire should be connected to?

As always your help is greatly appreciated!

Thanks!
Josh

[Bushleaguer]

There should be three ground wires (green) connected to a lug welded on the tank.  One goes to the fill tube, one to the sender, and the other goes to the negative side of the electrical system.

[GoneFission]

The ground wires on the tank go to the filler and a solid ground connection, such as the battery negative (-) terminal or the system/ground terminal block.  Normally it's not a good idea to ground other equipment (gauges, lights, etc.) to the gas tank ground tab.  AYBC rules prohibit this.  The ground wire for the tank sender goes on the sender itself (Teleflex and other senders have a terminal on them for ground and usually a center terminal for "sense" connection).  

See ya on the water!

[jsakat1]

Thanks a lot for the replies. As always this forum provides invaluable information for the new boater.  However I have a couple more  questions, Inside the bilge I can see that there are two studs, these apparently are holding a small rectagular plate outside the hull, in aft starboard side. My question is, Is this a grounding plate? Does anyone else has this on their 170's ? and if this is is the boats ground , what should be connected to it?. Mine is a 1987 170 Striper

[Bushleaguer]

I would venture to say that this plate is the connecting point for a bonding system.
http://www.yachtsurvey.com/ElectricalSystems.htm

The third topic in bold describes a bonding system and it's function (plus, the entire article give some great info on marine electrical systems in general.)