Electrical Maintenance 8-13
ALTERNATOR (THERMO KING)
Thermo King Alternators are painted Black and are identified by a label on the side of the Alternator that lists the Amp Rating,
the Service Part number and the drawing number.
Interchangeable with Bosch Alternators
The Thermo King Series Alternators are interchangeable with the current Bosch Alternators.
Alternator Exchange Table
CAUTION: “Full Fielding” Unlike other alternators a Thermo King alternator it is accomplished by installing a jumper from
terminal F2 to Positive Battery Voltage (+12V). Attempting to full-field the alternator by connecting Ground pin to terminal
F2 will cause regulator failure.
Complete the following checkout procedure before replacing the voltage regulator or the alternator.
• When testing alternators use accurate equipment such as a Thermo King (FLUKE 23) digital multimeter and a Thermo King
amp clamp or an equivalent.
• Make sure the drive belts and pulleys of the charging system are in good condition and are adjusted properly before testing
the alternator. Worn belts and pulleys or loose belts will lower the output of the alternator.
• The battery must be well charged, the battery cable connections must be clean and tight, and the 2A and excitation circuits
must be connected properly.
NOTE: All voltage readings should be taken between the negative battery terminal, or a good chassis ground, and the
terminals indicated, unless stated otherwise.
Amp Rating
37
65
120
Amp Rating Service Part number Drawing Number
37
44-9571 41-5458 41-6780
65
44-9572 41-5457 41-6781
120
41-2571 41-5456 41-6782
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