Wiring

From GTM Workshop

Build Manual Build Sequence Monocoque Front End Rear End Doors Finishing Donor Components Rover Metro Donor Components Rover 220/420 Components Build Sections Battery Beam end covers Bonnet and front spliter mould Boot bootlock and hinges Brake lines Carpets Dashboard cover Doors Engine cover moulding Engine frame Engine and auxiliaries Exhaust Front suspension Gear change Handbrake lever cables and calipers Door panels Trim Headlight covers Heater and pipework Lights Part trim panels option Pedal box and master cylinder Perspex screens rear and side Petrol tank filler neck and cap Pipes and services through the tunnel Radiator ducting and splash moulds to monocoque Radiator mould radiator and pipework Rear suspension Roof panel Seat belts Seats and runners Separate instrument option Setting up the car for the road Soft trimming Spare wheel mould and spare wheel Steering rack and column Throttle pedal Trimming hard panels Windscreen and rear bulkhead screen Windscreen washer bottle pipes and jets Wiper motor and blades Wiring Wiring loom insruments and fuse box 1800 gear change p.g.1 gearbox 1800 engine mountings 5AS alarm units Hydraulic clutch 1800 engine steady Spyder Supplement Top Seatbelt Mounting Hood Boot Engine Compartment Grills Stainless Steel Mesh

The Libra utilises the K Series Rover Metro or the Rover 100 wiring loom instruments and fuse boxes. Auxiliary wiring looms are used at the front, through the tunnel and at the back. The standard K Series Rover Metro dashboard loom is retained. The colours used are those in the K Series Rover Metro loom. The central auxiliary loom runs from under the dashboard forward through the front bulkhead of the monocoque and through the tunnel to the back of the car Both the front and rear auxiliary looms unplug to enable the front and rear panels to be removed completely with their own wiring looms attached. The standard Rover Metro steering column/Rover 100 steering column and switchgear is retained on the Libra. No wires run through the passenger compartment.

When utilising the GTM instrument pack the standard Rover Metro dashboard loom is discarded and a new loom provided with the instrument pack replaces it and plugs into the standard Rover Metro loom.

When using a modern K series engine is will necessary to fit a 5AS immobiliser. This immobiliser requires a separate auxiliary loom which runs from the rear of the car to the front of the car with the immobiliser positioned under the dashboard for weather protection. When utilising the latest K Series engine with MEMS3 units it is necessary to use an auxiliary loom to supplement the Rover 25 loom in the engine bay. This auxiliary loom plugs into the standard GTM loom Wiring for Rover 25 Engines.

Unfortunately the Rover 25 engine bay-wiring loom does not include the relay pack as on all other Austin Rover cars. It is therefore necessary to produce and additional harness with relays and fuses to supplement the original Rover 25 engine bay harness. This additional harness T0904 fits within the engine bay alongside the original Rover 25 engine bay harness. The new harness connects into the original Rover 25 engine bay harness and connects into the 5AS loom as provided by GTM. The Rover 25 uses a MEMS3 which in turn uses the same immobiliser as on previous models the 5AS unit. The MEMS3ECU and the 5AS unit have to be matched for them to work. If the units do not come off the same car this can be undertaken by GTM Cars Ltd. The rear oxygen sensor as used on the Rover 25 is not used on the GTM.

Assembly

The ECU relays and fuses associated with the engine mount on the bulkhead immediately behind the pas-senger seat. Connect the ECU to the Austin Rover engine bay-wiring loom. Connect the ECU to the GTM auxiliary engine bay- wiring loom. The connections to the GTM loom and the Austin Rover loom are all made just in front of the gearbox engine mounting inside the engine frame.

Before screwing the ECU fuse box and relay box to the bulkhead check that the wires will reach the appropriate connections. Secure the ECU relay box and fuse box to the rear of the bulkhead. Connect the large diameter brown wire to the live side of the starter solenoid i.e. the side to which the main red battery lead is connected.

Referring to the circuit information in the manual with regard to wiring connections for the MEMS3 en-gines, connect the wires together. It will be necessary to terminate the wires on the Rover 25 loom after removing the plugs. These terminals are supplied within the auxiliary wiring pack. The manual under the heading Rover 25 plug details indicates which plugs have to be removed and terminals fitted.

For example wire number one rev counter drive is black white in the MEMS3 loom and connects to the black white in the GTM 5AS loom. Wire number eleven ignition warning light is brown yellow in the GTM 5AS loom and connects to the brown yellow in the Rover 25 engine bay loom. Following this example con-nect the wires together down to number seventeen. The only other wire that may cause confusion is wire six which is a larger diameter brown wire in the MEMS3 loom and this has to be connected to the larger diameter wire in the standard GTM loom.

When everything else is completed and the engine runs satisfactorily it is best to insulate all these connections with insulation tape. Then secure the loom with tie wraps in appropriate places.