American Motors Gremlin Map Light Bulb Size

The American Motors Gremlin map light requires a 561 bulb size for proper illumination within the interior cabin area. Available data for the specified component covers the range from 1970 through 1978.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1974-1978	561
1970	561

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 44mm length, end-cap contacts. 12V, 12W.	561

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Additional Notes

The American Motors Gremlin uses the 561 bulb size for the map light across all listed model years.
The 561 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications shared across manufacturers.
It is a festoon-style bulb, which means it is cylindrical in shape and makes electrical contact through metal caps at each end rather than through a base socket.
The 561 bulb has a length of 44mm, which is a critical fitment factor, as festoon bulbs must physically span the contact points of the housing to seat correctly.
The bulb operates at 12 volts and draws 12 watts, values consistent with standard automotive interior lighting circuits.
The Gremlin used the 561 bulb for the map light across the 1974-1978 model years, as well as the 1970 model year.
The end-cap contact design of the 561 means that substituting a festoon bulb of a different length, even one with the same voltage and wattage rating, would result in an improper fit within the map light housing.