Rolls-Royce Silver Shadow & Bentley T Series
Workshop Manual
Chapter M
Section MI0 RELAYS The relay box, mounted to the bulkhead in the engine compartment, contains a printed circuit base to accommodate 'Lucas' Type 6RA relays. Details of these relays, and others used on the car are given in the Data Table at the end of this section. The relays connect through a printed circuit to loom sockets on the underside of the relay box. There are also relays fitted behind the front cover.of the relay box (see Fig. M59).
Cars not fitted with refrigeration
Cars fitted with refrigeration
An alternator replaces the generator. The relay box houses a 4TR control box (for 'Lucas' llAC alternator) and a warning lamp control unit. On later cars a C.A.V. 440 control box i s used (for C.A.V. 512 alternator). The relay box contains the following relays. On the main printed circuit base: Headlamp flick relay (not fitted to cars destined for U.S.A. and Canada) Horn relay Headlamp safety relay
There are four vacant relay positions on the printed circuit base (three for cars fitted with refrigeration, and one for cars fitted with headlamp dimming). The relay box also houses a 'Lucas' RB340 current/voltage regulator, and a regulator condenser used to reduce radio interference. The relay box contains the following relays. On the main printed circuit base
On the main printed circuit base: Headlamp flashing relay Horn relay Headlamp safety relay Water tap relay Interior lamps relay Height control re1ay Headlamp dimming relay (fitted to certain early cars) Behind the front cover
Coolant probe relay Ignition warning lamp/Choke relay (except cars fitted with C.A.V. alternators) Brake pressure (accumulator) relay Head flick relay (not fitted to cars destined for U.S.A. and Canada)
FIG. M59 RELAY BOX (REFRIGERATED CARS) 1 4TR alternator control unit 2 Brake pressure (accumulator) relay 3 Coolant probe relay 4 Ignition warning lamp/choke relay 5 3AW alternator warning lamp control unit