         
Honda & Toyota vehicle have many different styles of regulators. There are round sockets with 3 terminals and round sockets with 4 terminals. There is also an oval socket with 3 terminals. This technical bulletin will cover the round sockets with 3 terminals labeled S, IG, & L and oval sockets labeled S, IG, & L. The socket terminals uses are: S-sense: The voltage regulator uses the S terminal to sense the battery voltage. It always has to power whether Key-on or Key-off. IG-ignition: The IG terminal goes on and off with the ignition switch. It is the power input for the alternator. The alternator will not charge without power to the IG terminal L-light: This terminal has several functions: -It turns on the charge-indicator light when the key is in the "run" position. It supplies a path to ground for the charge-indicator light, making the bulb glow. -After starting the engine, on carbureted cars, the L terminal becomes an output. It supplies power to the electric choke and creates the same voltage on both sides of the charge-indicator light. No electricity can flow through the filament and the bulb goes out. -After starting the engine on fuel-injected cars, the L terminal simply goes "open". Since the path to ground is gone the charge-indicator light turns off. Part #'s R ound 3 Terminal with L terminal output (drives choke): 13229, 13239, 13240, 13241, 13277, 13322, 13323, 13331, 13383, 13390, 13408, 14449, 14454, 14457, 14458, 14460, 14472, 14611, 14643, 14668, 14671, 14674, 14678, 14679, 14682, 14683, 14756, 14843, 14847, 14855, 14857, 14935, 14939, 14974 Round 3 Terminal with no L terminal output (goes open): 13234, 13252, 13276, 13278, 13319, 13321, 13339, 13384, 13398, 13455, 13566, 14455, 14849 Oval 3 Terminal with L terminal output (drivers choke): 13409, 13486, 13487, 13489, 13496, 13497, 13512, 13536, 13659 Oval 3 Terminal with no L terminal output (goes open): 13457, 13481, 13482, 13492, 13495, 13499, 13500, 13501, 13502, 13537, 13545, 13546, 13547, 13551, 13552, 13553, 13556, 13557, 13558, 13668, 13687, 13706, 13711, 13732, 13747, 13754, 13755, 13756, 13806, 13844 Quick Test Procedure 1. If carbureted, unplug the electric choke. 2. Remove the plug from the alternator. 3. Turn the ignition key to "run" position. (engine off) 4. Use a test-light to test all three terminals in the car's harness plug. (Not the terminals on the alternator!) 5. Use chart figure 3 to troubleshoot. Figure 3- Trouble Shooting Chart: No Power To: "S" In Honda Check For: Main Fusible Link, & Fuse in the "S" circuit. In Toyota Check For: Main Fusible Link. No Power To: "IG" In Honda Check For: Main Fusible Link, Secondary Fusible Link, & Fuse in the "IG" Circuit. In Toyota Check For: Main Fusible Link, Secondary Fusible Link, Fuse in the "IG" circuit (labeled "Engine") No Power to: "L" In Honda Check For: Main Fusible Link, Secondary Fusible Link, Fuse in the "IG" circuit, Bad charge-indicator bulb In Toyota Check For: Main Fusible Link, Secondary Fusible Link, Fuse in the "L" Circuit (labeled "Ignition"), Fuse in the "L" Circuit (labeled "Charge"), Bad Charge-Indicator Bulb No Power to: "B+ Stud" Check For Honda: Main Fusible Link Check For Toyota: Main Fusible Link Source: Electrical Rebuilder's Exchange 
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