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Foglights

This component is part of Lights.

Definition

Cars with European style headlamps have integrated foglights.

Alternatively, separate foglights are available as an accessory.

General

Bumper mounted fog lights were sometimes seen on W113 Pagodas especially in Europe. Most were Bosch or Hellas. The Hellas were round, chrome, with curved back and clear bulb and lens.

The main purpose of the low mounted fog light is to have on-coming traffic see the light in the fog without being dazzled and to have the driver able to see forward without having the headlights reflected back by the fog.

Size of Unit and Bulb

Typical vintage Hella fog light had a 35 watt bulb with a bayonet base, was about 5.5 inches in diameter. Flat, rectangular Hellas came along a little later and were more commonly seen installed under the front bumper of the later W107 cars.

Integrated and External Fog Lights

Bumper (external) Fog lights were standard on some Mercedes models but not on the Pagoda. Headlights mounted on Euro version (non-USA) Pagodas had an integrated fog light.

USA sealed beam headlights (Style AC) included an integrated fog light until October 1968 when a new style headlight (Style AN) without a fog light became standard. The later style USA headlight (Style AJ) was also without a fog light.

Activation

When the headlight switch is pulled out when in either of the two main headlight positions, the headlight fog lights are activated. In some countries a fog light cannot be used at the same time as another headlight. In these countries, wiring was modified and a switch provided to allow the fog lights to work independent of the headlights.

An independently mounted Fog Light can be activated by the same Pull Out used for the integrated fogs if the external Fog light is tied into the connector for the Euro integrated fog light.

Bulb Access

Typical vintage round Hella fogs will have the name “Hella” on the lens. The bulb holder is accessed by removing the single screw at the bottom of the unit. This allows the entire bulb socket to be removed for easy access. The chrome reflector is accessed by removing the spring wire clips from around the perimeter of the inside assembly. Care is needed to ensure that the bottom screw is re-installed correct. A slight tilt can cause the screw to be misaligned.

Fog light bulbs are sometimes up-graded to H4 style lamps with an increase in light output and longer life. If higher wattage bulbs are used, make sure the fuse amperage is correct for the load of the new bulbs.

Connection to Bumper

A Hella external fog light is attached to the bumper by a single bolt. The light sits on an adjustable mount that allows tilting the fog light forward or back to move the light beam up or down to the desired position.

Adding a set of external fog lights might require that the controlling fuse be upgraded in amperage. See the section on Fuses in this Technical Manual.

A bumper mounted Hella fog light requires a single wire to power the light. This can be drawn off the same connector used for the Euro headlight fog light. The circuit is completed by the light body which is in contact with the bumper for the ground circuit.

Typical Vintage Hella Fog Light: shows the glass lens, chrome body, single screw holding the two part unit together, the drain hole, the single power wire, the upper attachment parts to allow tilting of the light unit. A small rubber rectangular pad should be placed under the upper attachment parts on the top of the bumper to protect the top of the bumper. Also note the bolt, washer, and nut for attaching the unit to the Bumper.

Photo detail: the thin flat grey part under the upper attachment "U" is a small rubber pad. It lays directly on top of the bumper to protect the chrome finish. The flat, slightly rusted, piece blow the rubber pad is a metal plate. It goes under the bumper to reinforce the bumper when the nut and washer are tightened. This under-bumper plate must make clean contact with the bumper to ground the unit.

Location

Some of the dealer added lights were positioned at the base of the small area of the nose panel between the headlight and the grill. These lights were sometime called “Driving Lights”. Other lights were installed on the bumper or under the bumper. A fog light typically has a narrow beam to pierce the fog while a driving light usually has wider beam for increased side to side illumination.

Esthetics

Some believe that bumper mounted fog lights spoil the “clean look” of the Euro version front. Others prefer the “Vintage” look created by bumper mounted fog lights.

Amber lens and amber bulbs may be available but most vintage fog lights have a clear lens and bulb.


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