TP-6805 8/1514 Section 1 Specifications
1.6 Alternator Specifications
Alternator Sp ecification 14RESA(L) 14RESA
20RESA(L)
20RESB
20RESC(L)
20RESD
20RESA
20RESC
Alternator model 2F5 2G5 2F7 2G7
Frequency Hz 50/60 50/60 50/60 50/60
Phase 1 3 1 3
Number of leads 4 12 4 12
Excitation method Static excited
Voltage regulator type Digital
Coupling type Direct
Insulation (rotor and stator) Epoxy varnish, vacuum impregnated; class 180 (H)
Winding material Copper
Bearing, number and type 1, Sealed ball
Brush length, new 19.05 mm (0.75 in.)
Circuit protection
Aux. winding mini-breaker 20 amps
Rotor resistance, ohms, cold 5.2 5.2 5.6 5.6
Stator resistance, ohms,* cold:
Single-Phase Leads 1-2, 3-4 0.06 — 0.02 —
Single-Phase Leads 11-44 0.13 — 0.04 —
Three-Phase Leads
1-4, 2-5, 3-6, 7-10, 8-11, 9-12
— 0.09 — 0.06
Leads 55-66 0.60 0.19 0.44 0.18
Stator output voltage with separately excited
rotor using 12-volt battery, minimum:
Single-Phase Leads: 1-2, 3-4 105 V — 88 V —
Single-Phase Leads 11-44 210 V — 176 V —
Three-Phase Leads
1-4, 2-5, 3-6, 7-10, 8-11, 9-12
— 140 — 112
Leads 55-66 142 V 190 117 V 150
Rotor field voltage/current readings at rated
output voltage, hot
No load 19 V/3.2 A 12 V/2.5 A 19 V/3.9 A 15 V/2.2 A
Full load 48 V/7.2 A 63 V/9.8 A 53 V/7.4 A 69 V/9.6 A
* Most ohmmeters do not give accurate readings when measuring less than 1 ohm. The stator can be considered good if a low resistance
reading (continuity) is obtained and there is no evidence of shorted windings (discoloration). Do not confuse a low resistance reading with
a reading indicating a shorted winding.
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