Fig. 194 - Testing Stator
Attached to the blower housing baffle are two small black
boxes; one (the rectifier box) has two black leads, and
the other (the regulator box) has one red lead and one
white lead. These leads connect to four pins in the
detachable plug. Leave boxes installed on blower
housing. Test rectifier with multimeter (using resistance
scale) to check resistance from each black lead pin to
blower housing (in an unpainted clean area). See Figure
195. After checking each pin, reverse meter leads and
recheck. The meter should show a reading in one
direction only. If either of the rectifier pins shows a meter
reading both ways, the rectifier is defective. If either of
the pins shows no reading either way, the rectifier is
again defective. Remove rectifier lead pins from
detachable plug and replace rectifier box. Instruction
sheet packed with rectifier assembly shows how to
remove lead pins from detachable plug.
Fig. 195 - Testing Rectifier
Test regulator with multimeter (using resistance scale)
as described in Testing Rectifier, except touching red
lead pin and white lead pin, as shown in Figure 196. If
the red lead pin shows a reading in either direction, the
regulator is defective. The white lead pin must show a
weak reading in one direction only. If meter indicates
otherwise, regulator is defective. Replace regulator by
removing rectifier pins from plug and installing rectifier
pins in new plug furnished with new regulator.
Instruction sheet packed with regulator assembly shows
how to replace pins in plug.
Fig. 196 - Testing Regulator
Testing Alternator Output
Install ammeter in series with charging lead, as in Figure
197. Start engine. Ammeter should indicate charge. If
battery is fully charged, ammeter will show little or no
needle deflection. If such is the case, connect a 12 volt
headlight lamp across battery terminals to apply a load.
Ammeter should then show increased charge rate.
If ammeter shows no charge, and if rectifier and
regulator have been tested, look for loose connections,
broken or frayed wires, etc. If there is no visible fault,
replace stator and re-test alternator output.