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Where Is the SPDT Automotive Relay on a 1999 Ml320

A single pole double throw, or SPDT, relay is the most common type of relay used in the automotive industry. This relay has multiple pins and is commonly located alongside fuses and other relays in automotive applications. In a 1999 Mercedes-Benz ML320, there are two locations for the SPDT relays. The primary relay location is on the right side of the engine compartment, inside the main fuse box. The second location is above the passenger side foot well. The primary engine fuse box contains relays for the anti-lock brakes, ignition system, cooling fans, and other primary systems. The secondary fuse box contains relays for most of the interior systems, such as the radio and door locks.

Instructions

Primary Fuse Box

1

Turn off the ML320s engine and open the hood.

2

Shine a work light in the back-right corner of the engine, near the firewall.

3

Locate the primary fuse box. It is a large black box, made from high impact plastic.

4

Release the snaps on the box cover. Remove the cover to expose the relays and fuses inside the fuse box. A diagram is printed on the underside of the cover detailing the function and location of each fuse and relay within the box.

Secondary Fuse Box

5

Open the front passenger door.

6

Shine a work light underneath the dashboard.

7

Look on the upper right side of the foot well area. The secondary fuse box is mounted on the upper-right side of the foot well area. This box is a smaller, square box made from the same black plastic.

8

Remove the black cover on the secondary fuse box by depressing the plastic locking tabs. There is also a diagram on the underside of the secondary fuse box cover that details the locations of the relays and fuses within the secondary fuse box.

Posted by Unknown at 2:45 PM

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