Chapter M ELECTRICAL SYSTEM - rrtechnical.info

1 Chapter M ELECTRICAL SYSTEM SECTION PAGE MI Battery MI M2 Fuse Panel M5 M3 Distributor, Ignition Coil and Sparking Plugs M9 M4 Starter Motor M 17 M 5 Alternator and Regulator M25 M 6 Generator M 41 M7 Exterior Lighting M49 M 8 Instruments, lnterior Lighting and Accessories M 5 3 M 9 Interior Switches M59 MI0 Relays M63 MI1 Windscreen Wipers, Motors and Washers M71 MI2 Horns M83 MI 3 Electrically 0 perated Window Lifts M85 M 14 Electrically Operated Front Seats M89 MI5 Radio Reciever, Cartridge Player, Loudspeaker and Aerial M93 MI6 Long Wheelbase Cars fitted with Centre Division MI01 MI7 Coachbuilt Cars MI03 MI8 Heater Blower Motors MI09 Rolls-Royce Silver Shadow B Bentley T Series Workshop Manual Chapter M Chapter M ELECTRICAL SYSTEM Section MI BATTERY Introduction The ELECTRICAL SYSTEM is negative earth.

2 ELECTRICAL components not described within this Chapter are given in the following list: Electric gear change actuator - Chapter T - Transmission Electric fuel pumps - Chapter K - Fuel SYSTEM Air conditioning - Chapter C - Servo inodule, Air conditioning voltage stabiliser Exhaust emission control - Chapter U - Primary & secondary Emission Control EGR lock-out switches Systems Important It is imperative that the negative (earth) lead is disconnected from rO I. the battery before commencing work X on the ELECTRICAL SYSTEM or 6 components, or if any electric arc V! I- welding is to be used on the motor car THE BATTERYMUSTNOTBECONNECTED OR RISCONNECTED WHEN THE ENGINE IS RUNNING. Battery-To remove (see Fig.)

3 MI) lmportant The acid in the battery is highly corrosive - do not spill. FIG. MI ACCESS TO BATCERY 1. Remove the trim panel covering the battery in the luggage compartment; the panel is hrld in position with contact strip or press studs. 2. Unclip the retaining strap. 3. Remove the battery cover and small tools tray. 4. Remove the two battery securing clamps. 5. Disconnect the battery terminals. 6. Protect the carpet with paper and carefully lift the battery from the car. Workshop Manual Rolls- Ro yce Silver Shadow B Bentle y T Series Chapter M Battery-To fit Reverse the procedure given for removal, noting the following points. 1. Ensure that the correct battery lead is fitted to the correct terminal, negative to negative, otherwise damage to ELECTRICAL com- ponents will occur.

4 2. Verify that the battery terminals are secure and positioned correctly. 3. Smear the terminals with petroleum jelly. (Do not use grease). Corrosion To remove corrosion from the battery leads and terminal posts, disconnect the leads and wash with hot water or a dilute solution of ammonium carbonate The ammonium carbonate solution must be removed with clean water; thoroughly dry the leads and terminal posts with a cloth. Connect the battery leads to the terminal posts on the battery and smear with petroleum jelly. Specific gravity-To check 1. Remove the battery as described in Battery - To remove. 2. Using a hydrometer, obtain the specific gravity and compare the reading against the figures given in Table 1.

5 Batt ery-To top-up 1. Remove the battery from the car. 2. Remove the cover from the filling trough. 3. Fill the trough with distilled water. 4. Clean and refit the trough cover. The cover will press down on each valve and allow an equal amount of distilled water to enter each cell. 5. With a damp cloth, clean the top of the battery; do not use petroleum or paraffin etc. 6. Refit the battery and ensure that the battery terminals are secure and positioned correctly. Note On late European cars, the battery has individual screw vent caps. Initial charge-For new batteries 1. The acid specific gravity figures given in Table 1 are corrected to (60%). To the speocific %cavity obtained add for every C (10 F) above this temperatuze.

6 Measured specific gravity at C (90'~) is ,corrected specific gravity 2. Fill the battery with cool accumulator acid preferably betyeen 4'~ (40 F) and 27'~ (80'~) of the correct specific gravity given in Table 1. 3. The electrolyte level will fall soon after filling and must be restored by the addition of more electrolyte, after which the battery must be allowed to stand for 3 hours. At the end of this period, topping up will again be necessary to obtain the correct level. 4. The recommended charge rate is 7 amp. for 12 hours. The charge may be interrupted provided that the charging periods are of at least 8 hours and the rest periods not exceeding 16 hours. 5. The charge will not be complete until the total specified charging time has expired, the voltage and specific gravity of each cell has remained constant throughout 5 successive hourly readings and gas is freely emitted from each cell.

7 Table 1 Dageni te Demon battery Air Temperature below 32'~. (90'F.) Specific Gravity Condition of Battery to Fully charged to Half discharged to Fully discharged Air Temperature above 32'~. (90 F.) Specific Gravity Condition of Battery to Fully charged to Half discharged to Fully discharged Lucas Pacemaker battery Air Temperature below 27O~. (~o'F.) Specific Gravity Condition of Battery Fully charged Half discharged Fully discharged Air Temperature above 27'~. (~G'F.) Specific Gravity Condition of Battery Fully charged Half discharged Fully discharged Rolls-Royce Silver Shadow B Bentley T Series Workshop Manual -- Chapter M 6. On completion of the charge, the specific gravity of the acid in each cell should not exceed the values stated in Table 1; if it does, acid must be withdrawn from the cell(s) and an equal volume of distilled water added.

8 The battery should then .z be charged for a further one hour and the specific - .- gravity measured again. - n The final z~justment of the acid level should be J made after the battery has been allowed to stand for two hours to allow excess gas to escape and the electrolyte level to fall..- k Battery-To charge 1. Remove the battery from the car. 2. Ensure that the battery charger is switched off. 3. Connect the battery charger leads to the battery, ensuring that the positive lead of the charger is connected to the positive terminal of Y the battery and the negative lead to the negative terminal. 4. Check that the filling trough cover is firmly in position (or screw caps fitted).

9 5. Switch on the battery charger and adjust the charging current to 7 amps (Max). 10 6. Periodically measure the specific gravity of S the electrolyte with a hydrometer and compare with the values shown in Table 1, when the fully charged g value is attained, the charging is completed. z A filled battery should not be allowed to remain in a discharged condition, it should be maintained in a fully charged condition by giving it a fresh charge once a month. The battery should be fully charged before it is put back into service. Rolls- Royce Silver Shadow & Bentley T Series Workshop Manual Chapter M The fuse panel is situated below the facia on the driver's side of the car (see Figs.)

10 M2 6. M3). To gain access to the fuse panel, unscrew the knurled retaining screw and lower the panel; an identification plate is fitted between the padded housing and supporting framework. Important It is important to note that if new glass fuses are required, they should be of ' Bulgin' manufacture %? and of the correct rating. Section M2 FUSE PANEL The fuse panel also houses the direction indicators flasher unit, the thermal cut-out button for the transmission actuator and the thermal cut- out for the headlamps protection circuit. If a refrigeration unit is fitted to the car, the fuse panel has seven small diodes fitted to prevent feed- back from the electric actuators (see Fig.