4 1/2 inch fan : 20A
5 inch fan : 22 Amp
Field coil resistance : 6 ohms
Lucas Part Nos: NDB100 , LRD100, Lrd00107, 22250, 22258, 22272, 22295, 22297, 222700, 222700l, 222700r, 22704, 22704A, 22704d, 22704h, 22704j, 22704i, 22705, 22705f,22705l, 22715, 22715e, 22715f,22715,h, 22715j, 22715k, 22717, 22725, 22742, 22742e, 22742k, 22747, 22747a, 22747b, 22748, 22748a, 22748b, 22754, 227542, 22765, 22765b, 22765j, 22767, 22767d, 22767f, 22775, 22775a, 22775e, 22785, 22785a, 22785d, 22789, 22789a, 22789d, 26021103,
B90 exchange unit
Austin Rover part no : AEJ12
Perkins part nos : 2871153, 2871161 , 2871178, 34263,
Ford part nos : 69EB10002C1, 69EB10002CA
Massey Ferguson part no: 3112299R91
Aftermarket: HC110482 (22Amp) , HC110483 (11Amp), WG5
Check condition and tension of dynamo drive belt.
Ignition warning lamp (WL) should illuminate with ignition key on and extinguish when the engine is running.
Residual field : Disconnect cables from dynamo , connect voltmeter between D terminal and chassis ground. Engine at approx 1500 rpm , Volt meter reading should be 1 to 3 volts
C40 Dynamo field circuit : Voltmeter connected between D terminal and chassis ground. Ammeter connected between D terminal and F terminal. Increase engine rpm until voltmeter reads nominal system voltage. Ammeter should read aprox 2 amps.
C40 Dynamo armature circuit : Disconnect cables , connect volt meter Black lead to D terminal , Red lead to Earth, run engine 1500rpm , meter reading should be 2 to 4 volts.
Required to polarise dynamo output either Negative earth or Positive Earth. Remove leads, touch a wire between the dynamo F terminal and battery live terminal.
A range of aftermarket products are available offering bolt on replacement units with similar appearance to the original C40 dynamo but are actually higher current output alternator conversions. The benefits of an Alternator include higher output at lower engine revolutions. Increasing current output requires upgrading cable specification.
Legal disclaimer : Any information on this web page is given in good faith but should not be relied upon as correct. all brands and trade names are respected as property of their legal owner with no association express or implied. By use of this website you accept and understand our terms and conditions which can be read by following the link: Terms