Zinc Anodes - Combating chassis and body/component corrosion in winter
For those that live in areas that use salt on the roads in winter you can help prevent corrosion to mild steel and aluminium components on your Jeep by adding a couple of small blocks of a zinc to the underside of the Jeep bonded electrically (via a grounding strap/wire) to the chassis. Marine grade zinc blocks will be OK as a source material.
When the whole underside (chassis & zinc blocks) is wet with salty water, a low voltage electrical circuit will be formed. The zinc blocks will act as a sacrificial anode and help protect Mild Steel & Aluminium components from the effects of galvanic corrosion.
It'll make no difference in the dry, but the zinc block will do no harm either.
If you notice (in the winter) that the blocks are getting a whitish powdery looking coat on them (not snow!) then they are corroding and are doing their job! Keep them free from oil & paint or they won't work properly.