Starter Generator 12V
Final Check (120 Volt AC Starter Motor)
Starting motor should be tested under maximum load.
To do this, turn engine by hand until compression stroke
is reached. Plug in starter. Belt should engage and
crank engine without slipping. When engine starts,
disconnect plug. Belt should not circulate while engine is
running. If two prong outlet is the only one available, it
should be converted to three prong outlet. See Fig. 138.
Fig. 138 - Checking Starter
12 VOLT BELT DRIVE STARTER
This Briggs & Stratton electric starter automatically
engages a belt clutch and cranks engine when a 12 volt
battery is connected between the terminal on the starter
and engine cylinder. When engine starts, the belt clutch
automatically disengages starter motor from engine.
Driven equipment should be disengaged from engine
prior to engaging electric starter. The starting system is
designed to turn over engine only. Fig. 139.
Fig. 139 - Starter Connections
Proper Electric Installation
Negative (-) side of battery must be grounded to engine.
This lead must carry starting current and therefore, must
be a No. 4 size wire or larger.
Another heavy lead (No. 4 or larger) should be
connected from the starter motor terminal through the
starter switch and to the positive (t+) battery terminal.
Fig. 140 - 12 Volt Wiring Diagram
A 12 volt battery of 40 to 45 ampere hour capacity is
For warranty and service on starter motors, contact
Authorized Representative of PrestoLite.
The two assemblies which had been used are shown
below. Fig. 141 and 142. Adjust as follows: Loosen nut
"A" and "B" slightly so the starter motor can just be
moved by hand. Move starter motor away from engine
as far as possible. Rock engine pulley back and forth
and at the same time, slowly slide the starter motor
toward engine until the starter motor pulley stops being
driven by the vee belt. Move starter motor another 1/16"
(1.6 mm) toward the engine. Tighten nuts "A" and "B."