What polarity is the vehicle's electrical system according to this plate?

The plate states the electrical system polarity on this vehicle is NEGATIVE EARTH (negative ground).

What does the caution plate require when connecting a battery?

It states that correct battery polarity MUST be observed.

Does the plate list any part numbers, dates, or model information?

No. The plate contains only the caution text about negative earth polarity; no part numbers, years, or model designations are visible.

Home/ Registry/ Ford/ Ranchero/ 1972-1976/ “ruby ring”/ Photo supermotors.net/registry/media/559143

Negative Earth Caution Plate - Battery Polarity Warning Data Plate

Yellow caution plate reading NEGATIVE EARTH electrical system polarity warning

Vehicle caution/ID plate stating the electrical system polarity is negative earth and correct battery polarity must be observed.

AI caption September 2007 · Photo 0 of 5000

This image shows a small yellow metal caution plate secured with four screws or rivets, photographed at close range (out of focus). The plate warns that the electrical system polarity of the vehicle is NEGATIVE EARTH (negative ground) and that correct battery polarity MUST be observed. This type of data/spec plate is typically fixed in the engine compartment to warn mechanics and owners not to reverse the battery connections, which could damage the alternator, wiring, or other electrical components. The plate contains no part numbers, dates, model designations, or other identifying information — only the polarity warning text. It was uploaded to the gallery of a 1972 Ford Ranchero, and while nothing on the plate contradicts that attribution, the wording 'negative earth' is characteristic of British-market vehicles. A reader can learn from this document only that the vehicle to which it is attached uses a negative-earth (negative-ground) electrical system and that battery cables must be connected with correct polarity when installing or jump-starting a battery.

Is this accurate? Sign in to help verify it.

Frequently asked questions

What polarity is the vehicle's electrical system according to this plate?: The plate states the electrical system polarity on this vehicle is NEGATIVE EARTH (negative ground).
What does the caution plate require when connecting a battery?: It states that correct battery polarity MUST be observed.
Does the plate list any part numbers, dates, or model information?: No. The plate contains only the caution text about negative earth polarity; no part numbers, years, or model designations are visible.