Electrical Equipment for Vehicles without M I D (Trailer Hitch) (For vehicles in which there is no prepared "body" and/or "instrument panel" wiring harness for trailer hitch.) Can be recognised from lack of 9-pin plug in "body" wiring harness and/or | 
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Lack of plug contact terminal "C" for turn signal relay. | 
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Drill hole. In rear end panel, drill hole Ø 20 mm/0.8 in. with centre bit. Use existing punch marks. Deburr holes and protect against corrosion. Detail 1: Models 53, 53-B, 54, 56, 57, 58, 59 Detail 2: Models 51, 52, 55
 Remove, Disconnect Ground cable from battery, wiring harness plug from each rear lamp. | 
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 Install, Connect Insert trailer hitch wiring harness with rubber grommet in rear end panel. Trailer hitch wiring harness plug to body wiring harness plug and to rear lamps. Models 53, 53-B, 54, 56, 57, 58, 59 Connect ground cable to body. Use existing ground connection beside rear lamp. 1 = Connection for permanent positive terminal 30 (red) | 
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Vehicles with prepared instrument panel wiring harness: Can be recognised from plug contact for turn signal terminal "C".
Remove, Disconnect Remove instrument assembly - see operation "Instrument Assembly, Remove and Install" in group "N". Release fuse box, turn signal relay.
Install, Connect Bulb with socket, instrument assembly, turn signal relay for trailer hitch. Only in conjunction with connection terminal "30" (permanent positive): Remove left panelling parts - see table on following page. | 
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Remove, Disconnect
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Models |
51/52 |
53-B |
53/54 |
56/57 |
58/59 |
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1. |
Panelling, rear section of rear quarter panel |
x |
x |
x |
x |
x |
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2. |
Panelling, front side |
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x |
x |
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3. |
Panelling, rear sill |
x |
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x |
x |
x |
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4. |
Panelling, front sill |
x |
x |
x |
x |
x |
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See corresponding operations in group "C". |
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1 See operation "Rear Quarter Panelling, Rear - Remove and Install. Models 51, 52, 53-B, 53, 54, 56, 57, 58, 59" in group "C".
2 See operation "Rear Quarter Panelling, Front - Remove and Install. Models 53-B, 53, 54, 56, 57, 58, 59" in Group "C"..
3 See operation "Panelling, Rear Sill - Remove and Install. Models 51, 53, 54, 56, 57, 58, 59" in group "C".
4 See operation "Panelling, Front Sill - Remove and Install. Models 51, 52, 53-B, 53, 54, 56, 57, 58, 59" in group "C".
Remove, Disconnect Unbolt fuse box (1) and detach retaining spring (2), turn fuse box to front (reverse accessible), release cable from output fuse no. 8 and remove. Cut off contact spring and insulate. Fuse output = relay side | 
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Install, Connect Extend cable (red) from trailer hitch wiring harness and route along body wiring harness to fuse box. Connect cable to output fuse no. 8. Fuse 20 A in position 8, fuse box.
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Fuse output |
= relay side |
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Fuse input |
= underside |
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Vehicles without prepared instrument panel wiring harness. Can be recognised from lack of plug contact "C" for turn signal relay.
Remove, Disconnect Remove instrument assembly - see operation "Instrument Assembly, Remove and Install" in group "N", turn signal relay, footwell panelling driver's side. Release fuse box, and turn towards front (rear side accessible). |
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Install, Connect Connection cable between turn signal terminal "C" and instrument. Install connection cable with flat plug at designated point. | 
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Install, Connect Connection cable to wiring harness plug (12-pin) with spring contact to position 6 of wiring harness plug - if necessary, modify wiring harness plug and circuit board. Bulb with socket in instrument, instrument assembly. | 
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Extend cable (red) from trailer hitch wiring harness and route along body wiring harness to fuse box. Connect cable to output of fuse no. 8. Cable from input of fuse no. 8 to positive terminal of battery, fuse 20 A to position 8, turn signal relay, fuse box.
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Fuse output |
= relay side |
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Fuse input |
= underside |
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Install panelling |
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