Use a labeled circuit map from the engine bay cover or service manual before replacing any protective element, as slot positions and amperage ratings differ between production batches of this V8 roadster. Check the left-side compartment panel and the secondary block near the passenger footwell to identify each circuit branch tied to lighting, ignition, climate control, and power accessories.
Each protective insert is marked by color and numeric value, typically ranging from 8A to 25A, with higher ratings assigned to systems like the cooling fan and power windows. Corrosion on contact points is common in older units; remove oxidation with a fine abrasive and verify continuity using a multimeter rather than relying on visual inspection alone.
Pay attention to circuit grouping: front lighting and horn circuits share adjacent slots, while interior electronics are clustered separately. Misplacing even a single insert can disable multiple subsystems or cause intermittent faults. Always match amperage exactly; installing a higher-rated component risks overheating the wiring harness.
For precise identification, cross-reference the numbering scheme stamped near the mounting panel with a factory service chart. Variations may exist depending on market configuration and optional equipment, so confirm whether the vehicle includes features like heated seats or upgraded audio, as these alter the layout.
1985 Mercedes SL 560 Fuse Diagram: Practical Guide for Identification and Troubleshooting
Locate the power distribution panel under the dashboard on the driver’s side and verify each circuit using the original amperage ratings stamped on the metal strips. The classic roadster from this series uses color-coded metal links rather than modern blade inserts: red (16A), blue (25A), and clear/white (8A). Corrosion on the strip contacts is a frequent cause of intermittent electrical faults–clean each contact point with fine sandpaper and apply dielectric grease. Pay close attention to circuits linked to the fuel pump, climate control, and lighting system, as these are commonly affected by aging connections rather than component failure.
For troubleshooting, match each slot to its assigned function using the factory layout chart typically printed inside the cover panel. If the chart is missing, trace wiring harness colors: for example, brown wires indicate ground circuits, while red with a stripe often carries постоянное питание. A failed metal link may appear intact but lose conductivity under load–test continuity with a multimeter instead of relying on visual inspection. Replacing with incorrect amperage can damage switches or wiring, especially in older German electrical systems where tolerances are tight. If repeated failure occurs in the same slot, inspect downstream components like relays or motors rather than repeatedly swapping the strip.
How to Locate and Read the Fuse Box Diagram in a 1985 Mercedes SL 560
Open the engine bay and check the driver-side rear corner near the firewall; the electrical panel is housed in a black plastic enclosure with a snap-on lid. Remove the cover carefully–on its inner surface you will usually find a printed layout showing circuit positions and amperage ratings. If the print has faded, inspect the underside with a flashlight or clean it gently to reveal numbering. Some vehicles also have a secondary panel inside the cabin, typically beneath the dashboard or behind a kick panel on the passenger side.
Identifying the Layout
Each slot is labeled with a number that corresponds to a specific circuit. Match these numbers to the printed chart to understand which component each slot protects. Pay attention to amperage values marked in different colors or numbers, as installing the wrong rating can damage wiring or components.
- Red: higher amperage circuits such as cooling fans or power accessories
- Blue or white: mid-range loads like lighting or audio
- Clear or beige: low-load circuits such as control modules
Reading and Interpreting the Chart
The chart uses abbreviations for systems; for example, “LH” may refer to left-hand lighting, while “AC” indicates climate control. Cross-reference unclear abbreviations with a service manual specific to the R107 chassis. Follow this sequence when diagnosing:
- Locate the numbered slot tied to the malfunctioning system
- Check the metal strip inside the insert for breaks or discoloration
- Verify the amperage marking matches the chart
- Replace only with identical rating if defective
Consistent numbering and labeling allow quick tracing of electrical faults without dismantling large sections of the vehicle.