What do the relay terminals 30, 85, 86, and 87 do in this aux light wiring diagram?

Per the legend: 30 is power in from the battery, 85 is ground to chassis, 86 goes to the switch, and 87 is power out to the lights.

What size fuse is used for the auxiliary lamp circuit?

A 15A lamp fuse, inline on the red wire between the battery and relay terminal 30.

Where should I tap the green trigger wire for fog lamps versus driving lamps?

For fog lamps, tap the green wire to the low beam wire; for driving lamps, tap it to the high beam wire. In both cases the lamps should only come on with those beams due to legal requirements.

Can the auxiliary lamps be wired to work independently of the headlights?

Yes, but for off-road use only: tap the green wire to the parking lamp wire so the lamps operate independently from high/low beams. The parking lamps must be on for them to operate.

What wire colors are used in this relay circuit?

Red from the battery through the 15A fuse to relay terminal 30, blue from terminal 85 to ground, yellow from terminal 86 to the switch, double black from terminal 87 to the lamps, blue grounds at each lamp, and a green trigger wire tapped to the headlamp circuit.

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Auxiliary Fog/Driving Lamp Relay Wiring Diagram - Hella 500 Style, 15A Fuse

Fog and driving lamp wiring diagram with relay, 15A fuse, switch and headlamp tap points

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Auxiliary fog/driving lamp wiring: battery to a 15A lamp fuse, through a relay (30/85/86/87) controlled by a switch, with notes to tap green wire to low-beam (fog) or high-beam (driving).

AI caption February 2006 · Photo 131 of 364

This document is a hand-drawn style wiring diagram for installing auxiliary lights (fog or driving lamps, e.g., Hella 500-type lamps per the filename) using a relay circuit. It shows a battery feeding a 15A lamp fuse via a red wire, then to terminal 30 of a lamp relay. The relay legend explains the terminals: 30 is power in from the battery, 85 is ground to chassis (blue wire), 86 goes to the switch (yellow wire), and 87 is power out to the lights via a double black wire that splits to two lamps, each grounded with a blue wire. The switch is triggered by a green wire tapped into the vehicle's headlamp circuit, with a blue wire to ground. Detail views show the lamp housing with grommet, wire from bulb, and ground to tab in lamp. Installation notes explain three tap options for the green trigger wire: to the low beam wire for fog lamps, to the high beam wire for driving lamps (both for legal compliance), or—for off-road use only—to the parking lamp wire so the lamps operate independently of high/low beams (parking lamps must be on). A reader learns the complete relay-based aux lighting circuit, wire colors, fuse rating, and legal wiring options.

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Frequently asked questions

What do the relay terminals 30, 85, 86, and 87 do in this aux light wiring diagram?: Per the legend: 30 is power in from the battery, 85 is ground to chassis, 86 goes to the switch, and 87 is power out to the lights.
What size fuse is used for the auxiliary lamp circuit?: A 15A lamp fuse, inline on the red wire between the battery and relay terminal 30.
Where should I tap the green trigger wire for fog lamps versus driving lamps?: For fog lamps, tap the green wire to the low beam wire; for driving lamps, tap it to the high beam wire. In both cases the lamps should only come on with those beams due to legal requirements.
Can the auxiliary lamps be wired to work independently of the headlights?: Yes, but for off-road use only: tap the green wire to the parking lamp wire so the lamps operate independently from high/low beams. The parking lamps must be on for them to operate.
What wire colors are used in this relay circuit?: Red from the battery through the 15A fuse to relay terminal 30, blue from terminal 85 to ground, yellow from terminal 86 to the switch, double black from terminal 87 to the lamps, blue grounds at each lamp, and a green trigger wire tapped to the headlamp circuit.