Westfield SEiW, Replacement of Rectangular Fog and Reversing lights with circular ones to match stop / tail  & indicator lights.

Disclaimer.

This procedure is a guide to replacing the rectangular reversing and fog lights with the new circular lights, to match the new style rear lights used on the bike-engined cars. The parts cannot be sourced from Westfield Sports Cars. The parts and procedure are not approved by Westfield Sports Cars. This procedure is undertaken at your own risk.  E.M Engineering accepts no responsibility for damage to any vehicle, however caused, by using this procedure. 

Photo 1.  Old fog lamp and new rear lights

Introduction

Over the past year Westfield have introduced circular rear light clusters.  Having fitted the new rear lights we considered that the look of the rear of the vehicle would be improved by fitting matching fog and reversing lights. The problem was limited clearance between the back of the body and the fuel tank.  As part of our investigation, we contacted the Perei Group Ltd, manufacturers of the Stop/ tail / indicator lamps used by Westfield, who were most helpful in solving the problem.   Perei identified matching fog and reversing lamps that had right angled bulb holders. When fitted to the mounting base, the backwards protrusion was approximately 37 mm.  The distance between the bodywork and fuel tank on the Westfield is position dependant  but averages around 50 mm, so there would be plenty of space to fit the new lights.

Photo 2. New fog lamp, reversing lamp, bulb holder and mounting base

Tools

Medium Cut Half Round File; Fine blade keyhole saw; Electric Drill; 4mm Drill Bit, 5.5 mm Drill Bit, Dremmel multi-purpose tool fitted with 407 or 408 sanding bands, Flat blade screwdriver, Phillips or X point screwdriver; Socket set including a 8mm Socket; 8mm ring or combination spanner; Soldering Iron or Crimping tool; Heat Gun or Hair Drier.

Parts,

Fog lamp (Perei Part No: RF7RA)  (1); Reverse lamp (Perei Part No: RL800RA) (1); Mounting Plinth (Perei Part No: RF7P) (2); 2 Way connector kit (Perei Part No: 949200) (2); No8 x 15mm Self Tapping Screws (4), M5 Stainless Set Screws (4,) Wiring looms from the old fog and reversing lights;  300 mm x  6.4mm Heat shrink tubing (2)

Safety Precautions:  Disconnect the battery positive (Red) Terminal before starting work. If using a jack or axle stands to support the car ensure that the car is on firm level ground and that any mechanical locks are applied. Because of the close proximity of the fuel tank, when drilling holes in the rear of the body, place a wooden board between the body and the tank. 

Photo 3. Old fog Lamp

Procedure: RHS fog lamp. The procedure is repeated for the LHS reversing lamp.

Old Fog Lamp / Reversing Lamp Removal

Remove the boot lid  (if fitted) and the boot box for access purposes

Jack up the car, place on an axle stand and remove the rear wheels

Disconnect the fog lamp / reversing lamp from the wiring loom by unplugging the connector in the rear wheel arch.

Remove the red  / clear lens by undoing the 2 retaining screws and withdraw the reflector and bulb holder.  Cut the wires to the bulb holder close to their terminations on the bulb holder.  Withdraw the wires through the back of the lamp in to the wheel arch (You should have approx 300mm of wire terminated in a 2 pin plug - retain for later use)

Undo the 2 x M5 bolts holding the fog / reversing light assembly to the rear of the body, using the 8mm socket and ring spanner.

Remove the fog / reverse light body from the rear of the body

To protect the surface of the rear of the body, cover the area where the new fog light housing is to be fitted with masking tape.

Before proceeding further test the depth of the space between the body and the fuel tank. This can be done by wrapping masking tape around the blade of thin bladed screwdriver and using it as a probe through the hole for the wiring loom of the old lamp and marking the depth on the masking tape.  If in doubt the procedure can be aborted at this stage and the fog / reverse lamp refitted. Using this method, we determined that we had 55mm available. The depth is dependent on the vertical position of the lamp but 55mm is ample space in which to fit the new lamps.

Wiring loom

Modify the wiring loom of the old fog / reversing lamp, removed and retained earlier. The right-angled bulb holder of the new lamps is terminated in a two-pin plug and connection is made using the 2-way connector kit as follows.  

Photo  4. Modified wiring loom in- situ (fog Lamp	Photo 5 Modified wiring loom in situ  (reversing lamp)

Using the old wiring loom. Trim the end of the wires, remote from the main wiring loom plug, level.

Bare the wire by removing a small amount  (approx 5- 8mm mm) of the insulation.

Slide a length of heat shrink tubing over the wires. Leaving approx 15 mm of wire exposed.

Solder or crimp the connectors of the 2-way connector kit to the ends of the wires.

Push the connector on the black lead in to the back of the socket housing, ensuring that it locks in place. Repeat with the connector on red/blue wire  (Note black and Green/Brown wire for the reversing lamp).

Gently heat the tubing to shrink and form the loom

Apply additional insulation with insulating or looming tape as required

Photo 6. Trial fit fog / reversing lamp mount

Fitting the new fog / reverse lamp mounting base

If not already done, cover the area of the rear body, where the fog / reversing lamp is to be fitted with masking tape.

Place the new mounting in place, centralising on the old fog lamp mountings, ensuring the lamp fixing holes are horizontal.

Adjust the position slightly lower, if required, ensure that the mounting covers the holes of the old fog / reversing lamp,  (Make sure the fog / reversing lamp are level and relatively in the same position with respect to the rear lights) 

There are 4 possible mounting holes, Use the upper right and lower left holes (hex head mouldings). Mark the fixing holes of the mounting on the masking tape

Drill the holes in the bodywork using a 5,5 mm drill. Taking care not to damage the fuel tank.

Though not strictly necessary, but as a matter of personal styling we backed the mounting base with 5mm vinyl beading available from Vehicle Wiring Products (VWP)

Photo 7.Cut out the holes for the bulb holder

Temporarily fit the mounting using 2 x M5 Hex head set screws, penny washers and nyloc nuts

Mark the central hole for the lamp on to the masking tape.

Remove the mount.

Cut out the central hole (take care not to damage the fuel tank), by drilling a ring of 4mm holes inside the periphery of the hole to be cut in the rear body. 

Cut out the hole using a fine blade saw.  Smooth out the hole with a half round file or Dremmel multi-purpose tool until the rear of the lamp, with bulb holder fitted, just passes through the hole

Photo 8. Refit the mountings	Photo 9. Fog lamp fitted	Photo 10. Reverse lamp fitted

Refit the housing as before

Fit the fog / reverse lamp in to the housing, Secure with self-tapping screws.

In the wheel arch, connect the wiring loom between the fog / reversing light and the vehicle-wiring loom.  As shown in Photo 4.

Dress the wiring loom so that it will not chafe on the chassis or fuel tank, but leave sufficient flying lead to so that the bulb can be changed by withdrawing the lamp from the housing. Secure with cable ties as necessary

Photo 11. Rear and reversing lights	Photo 12. Fog & rear lights

Repeat the procedure for the LHS reversing lamp.

When the fitting of the reversing lamp is complete, replace the road wheels and tighten to the correct torque values as detailed in the build manual.

Re-connect the battery.

Test all lamps and indicators for serviceability. 

Refit the boot box and boot lid.

Acknowledgements

Our thanks to Robert Perei and the staff of The Perei Group Ltd. for their generous help, and support in this project.