ALTERNATOR7 Amp7 AMP REGULATED ALTERNATORUsed on Model Series 140000, 170000 and 190000The 7 ampere regulated alternator uses both a rectifierand a solid state electronic regulator for rapid charging orextra electrical loads. The regulator protects the batteryfrom overcharge. The alternator requires less than 0.2horsepower.Fig. 186 - Alternator AssemblyCondition Found (Fuse Blown)Check if battery polarity is correct. Negative (-) side ofbattery should be grounded to engine or frame; positive(+) side of battery to alternator output lead.If reversed. correct and out in new fuse.Fig. 187 - Typical Wiring InstallationCondition Found (Battery Run Down) Certain operatingconditions could cause the regulator to malfunction,permitting the battery to discharge even after then engineis stopped. To prevent such a malfunction, and thepossible inconvenience of a “dead” battery, an isolationdiode assembly (an electronic check-valve) is installed inthe alternator output lead, on engines with 7 ampereregulated alternators.The isolation diode assembly is installed at the time ofproduction, or may be added with kit #390607 describedas follows:Disconnect cable from (-) negative (ground) batteryterminal. Unscrew fuse holder cap from fuse holder bypushing in and twisting counter-clockwise. Remove andsave fuse. Mount diode assembly in one of the variouspositions shown in Fig. 188. Use ½” long screw,lockwasher and flat washer. If diode assembly ismounted on tank strap, install clamp between lockwasher and strap.Fig. 188 - Diode Mounting PositionsThe body of the isolation diode assembly should not rubagainst any metal part. Repeated contact with a metalpart could wear through the insulation, causing a short.Insert fuse in fuse holder on engine. Assemble fuseholder cap on white lead of diode assembly to fuseholder on engine. Attach connector on red lead of diodeassembly to original fuse cap, which was disconnectedabove. No fuse is used at this connection. Wrap twoturns of wire, provided with diode assembly, between capand socket. Secure the wires and socket with tape toprevent rubbing or interference with other parts. See Fig.189.Fig. 189 - Wiring Connector58
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