Classic and vintage vehicle autoelectrical systems often feature more basic automotive wiring systems than modern vehicles with unique idiosyncracies.
Vintage british vehicle wiring systems may include bakelite switchgear, and a limited number of fused circuits. with occasional ignition and auxilliary circuits protected by fuses. Relays and Solenoids may be fitted to provide remote switching.
Typical classic vehicle wiring circuits use copper cored wiring with solid colour insulation on cables to supply power to switches.
Switched live from switches to components such as lights may be wired using cable with a solid + tracer colour insulation.
Wiring faults can arise due to component age and deterioration. Replacement parts may be obsolete and hard to source though classic car clubs can be a good source to locate rare components. Because old car wiring systems may lack adequate circuit protection, the fitting of additional fuses is often recommended to increase wiring protection and safety.
Older Classic and vintage car and tractor electrical systems can feature different system voltage to modern vehicles, including 6 volt starting and charging. 6 Volt car electrical equipment can be particulary difficult to source. It may be possible to rebuild 6 volt starter motors and dynamos subject to component availability.
Distributor ignition systems found on classic vehicle petrol engines feature a two stage ignition coil with primary low tension circuit switched by contact breaker points set to correct air gap. Dwell angle refers to when contact breaker points are closed. A secondary high tension circuit is connected to distributor cap centre terminal. A rotating arm (rotor arm) switches high voltage power between distributor cap centre king lead terminal, and the radially located cylinder lead terminals in engine firing order. High tension HT leads carry the ignition spark to spark plugs located in each engine cylinder.
Vintage vehicles may be fitted with a 'Dynastart' unit which combines an electric starter and generator. A v-belt is often used running directly on the flywheel periphery or on crankshaft pulley. Some dynastart versions may use chain drive. Dynastart units may be of four pole design with two poles carrying series windings for starting, and two shunt windings for power generation similar to a conventional series wound dynamo. If a dynastarter fails to operate check battery cell condition and electrolyte level, battery voltage and terminal connections, check for slipping belt, jammed or broken drive mechanism.
The series wound two brush dynamo output is controlled by a current voltage control (cvc) regulator often mounted in engine bay or bulkhead.
The earlier three brush dynamos may be found on certain vintage vehicles, where dynamo output is controlled by the driver moving the third brush position via a mechanical linkage and lever.
Classic and vintage vehicle ignition systems may include
HT ignition coil,
Ignition distributor with mechanical or vacuum ignition advance and retard adjustment.
Classic vehicles may feature vehicle lighting systems which do not meet todays road vehicle lighting standards but may be legally acceptable due to first use & date of manufacture or avoid Mot test regulations due to age.
We have sandblasting sodablasting & welding equipment for restoration cleaning of classic vehicle parts
Mobile autoelectrician service available for vehicle wiring service and repair to electronic and mechanical systems classic cars, commercials & tractors. Experience of working on a wide range of American, British, European and Japanese classic vehicles including Alvis, Audi, Austin, BMC, BMW, British Leyland, Buick, Commer, Citroen, Daimler, Dodge, Ford, Fordson, Ferguson, Fiat, Hillman, Humber, Jaguar, Jensen, Landrover, Lotus, Mercedes-Benz, Morris, Riley, Rolls-Royce, Rover, Sunbeam, Toyota, Triumph, Vauxhall , Volkswagen, Wolseley
Some information interpreted from an old car wiring diagram dating 1940's. Different vehicle wiring diagrams vary !
|Wire No.||Wire Colour||Function||Component|
|1||Red||Sidelamps, tail lights, Boot light, Panel lights rheostat||Lighting circuit|
|2||Red & Yellow|
|3||Red & Blue|
|4||Red & White|
|5||Red & Green|
|6||Red & Brown|
|7||Red & Black||Dipper Solenoid Switch|
|8||Yellow||D Dynamo||to brush|
|9||Yellow & Blue|
|10||Yellow & Green|
|11||Yellow & Brown|
|12||Yellow & Purple|
|13||Yellow & Black||Battery Negative to Ammeter to Cigar Lighter fuse|
|14||Blue||Lights H at Light Switch||Headlights|
|15||Blue & White|
|16||Blue & Green||Cigar lighter fuse to cigar lighter & switch|
|17||Blue & Brown|
|18||Blue & Purple||Petrol gauge to tank unit||Fuel level|
|19||Blue & Black|
|20||White||Ignition||A3 Voltage Regulator, Ignition to Coil SW, Ignitio to push switch solenoid|
|21||White & Green|
|22||White & BrownIgnition Coil to Contact Breaker CB (Points)|
|23||White & Purple||F Dynamo to Ammeter A|
|24||White & Black||A1 at Current Voltage Regulator, A at Light Switch|
|26||Green & Brown|
|27||Green & Purple||Screen Wiper Switch to Motor|
|28||Green & Black||Screen wiper switch|
|30||Brown & Purple|
|31||Purple||Horn||Power to Horn|
|32||Purple & BlackStop lamp switch, Fuel guage power, Sreen Wiper switch power||Brake lights, Fuel level|
|33||Black||Chassis Ground||to Battery Negative|
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