Service manual

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21. ELECTRICAL FLOW CHARTS
6536 SERIES
With the use of these flow charts, you will be able to quickly
identify a non-working problem. Determine if the problem is
high or low voltage and then solve the problem.
IMPORTANT NOTICE
When using a jumper wire to diagnose
a low voltage problem, Never Short
Any Positive Terminal to Ground or
the Terminal Marked “B”. Serious
thermostat or p.c. board damage may
occur.
To use these flow charts, start at the top left corner. Using a
volt-ohm meter, check what is indicated in that box. If the
answer to what is indicated is No, work horizontally until you
find the problem. When the answer is Yes or OK, work the
chart downward until you locate the problem. Do Not Move
Downward on any chart until all preceding steps have been
confirmed good. Do Not start in the middle of any chart
without knowing everything previous (upward on the chart) is
OK or you may replace the wrong part.