![background image](http://html.mh-extra.com/html/david-brown/cropmaster-vag-1c-series/cropmaster-vag-1c-series_operating-and-maintenance-instructions-manual_514483040.webp)
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
The tractor electrical equipment and wiring are of robust design,
reducing to a minimum the possibility of failure. They are of proprietary
manuf�cture and in the event of electrical trouble, even though the tractor
operator may possess an elementary knowledge of electrical fault location
and repair, it is advisable to consult a David Brown dealer or one of the
manufacturer's appointed agents.
The electrical trouble-tracing points contained in this section are
intended to he used in an emergency to enable the operator to overcome an
immediate difficulty when expert assistance is not available.
Points in the location of electrical trouble and causes (always refer to
the wiring diagrams on Page.,
34
and 35), are as follows:-
Battery (discharged)
This will result in failure of the entire electrical system, with the
exception of the magneto ignition, and may be due to : (1) Electrolite
not up to level (see Battery, Page
33); (2)
dirty or loose battery con
nections ;
(3)
excessive use of the starter motor;
(4)
dynamo not charging
(see Dynamo, Page
33) ;
or
(5)
wiring short circuit (see Wiring, Pages
34,
35
and 40.
Dynamo (11ot charging)
Indicated by the ammeter needle showing discharge when the tractor
engine is running at normal working speed. Probable causes: (1) Brushes
worn or dirty (see Dynamo, Page 33); (2) cut-out not operating correctly
(consult a David Brown dealer) ;_ (3) wiring loose (examine terminals on
battery, dynamo, ammeter and fuse-box);
(4)
break in wiring (see Wiring,
Page 40) ; or (5) failure of fuse (befor.e replacing the fuse wire an entire
check of the d
yn
amo circuit should he carried out to ascertain the cause).
Note : Ammeter needle
will
show a reduced dynamo output when
battery is fully charged.
Starter (not operating)
Probable causes : (1) Battery-in a discharg.ed condition; (2) battery
connections loose or dirty; (3) starter motor brushes require cleaning or
renewing (see Starter, Page 33); (4) loose wiring connections to ·starter.;
(5) switch control not operating correctly.
PAGE 39