- Colt (1971-73)
- Mazda (1971-73)
CHANGES, CAUTIONS, CORRECTIONS
BATTERY INSTALLATION, BATTERY CHARGING, OR USING A BOOSTER BATTERY FOR ENGINE START - Reverse polarity or excessive voltage will result in extensive damage to alternator system. Note the following to prevent damage:
Battery Installation - Negative battery terminal must be connect to ground (negative ground system) and positive battery terminal must be connected to starter. DO NOT reverse battery leads.
Battery Charging - If a Quick Charger is used, both battery cables must be disconnected from the battery. DO NOT use a Quick Charger to provide starting voltage.
Circuit Interruption - Battery must NEVER be disconnected when alternator is running.
High Voltage - DO NOT use a high voltage source to test diodes.
Booster Battery (For Engine Start) - Booster battery must be connected with negative lead to negative battery terminal and positive lead to positive battery terminal. DO NOT reverse battery leads.
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| MITSUBISHI ALTERNATOR ASSEMBLY |
DESCRIPTION
Mitsubishi alternators are conventional three-phase, self rectifying type units containing six diodes (three positive and three negative) which are used to rectify current.
APPLICATION
Model Part No.
Dodge Colt
1971-72 ....................................... AC2040K
1973 ............................................. AG2040K
Mazda
1971
616 ...................................... 0290 18 300A
1200 ....................................... 0324 18 300
R-100, RX-2 .......................... 0839 18 300
1972
1200
Standard ............................... 0324 18 300
Optional ..............................0327 18 300A
618
Prior to 1/72 ...................... 0290 18 300A
From 1/72 ......................... 0552 18 300A
Optional from 1/72 ............. 0824 18 300A
808
Prior to 1/72 ...................... 0290 18 300A
From 1/72 ......................... 0552 18 300A
B1600 .................................. 0605 18 300A
RX-2, RX-3 ........................... 0866 18 300
1973
808
Prior to 6/73 ........................ 0552 18 300
From 6/73 ........................... 0453 18 300
B1600 .................................. 0605 18 300A
RX-2, RX-3 ........................... 0866 18 300
SPECIFICATIONS
Nominal Output @ 2500 RPM
Application Amps *Volts
AC2040K .......................... 40 ........................... 14
AG2040K ...................... **33 ........................... 14
0290 18 300A .................... 32 ........................... 14
0324 19 300 ....................... 20 ........................... 14
0453 18 300 ....................... 50 ........................... 14
0552 18 300 ....................... 40 ........................... 14
0552 18 300A .................... 45 ........................... 14
0605 18 300A .............. ***28 ........................... 14
0824 18 300A .................... 60 ........................... 14
0839 18 300A .................... 32 ........................... 14
0866 18 300 .............. **** 32 ........................... 14
2329 18 300A .................... 32 ........................... 14
* - Rated output is 12 olts.
** - At normal temperature, 30 amps. at hight temperature.
*** - For 1972, 35 amps. for 1973.
**** - For 1972, 50 amps. for 1973.
Coil Resistance (Ohms)
Application Rotor Stator
All Colt .................................. 4.7 ............................. *
All Mazda .......................... **5-6 ............................. *
* - Test must show current continuity, no given alue.
** - Rotor resistance for 0866 18 300 in 1971-72 is 4-6 ohms.
Brush Wear Limit - To wear limit line (one third of original length).
Brush Spring Pressure - Standard value for 1973 is .79 lbs. with minimum of .46 lbs. For 1971-72, spring pressure is .6-.9 lbs.
TESTING
NOTE - Some testing is done as part of Overhaul procedure.
ON CAR TEST
Whenever battery is discharged and charging rate is low, following test should be made to determine whether fault lies in alternator or regulator. First, place ammeter between "A" terminal of regulator and battery. Disconnect wire at "F" terminal of regulator and touch lead "A" terminal of regulator. If charging rate remains constant, alternator is defective. If current increases greatly, then regulator is faulty.
OVERHAUL
DISASSEMBLY
1) Remove brush cover and through bolts. Separate diode end housing from drie housing by tapping front
bracket lightly with a soft mallet.
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| CHECKING DIODES |
2) Place rotor shaft in padded vise using caution. Remove pulley nut, pulley, fan and spacer. Remove rotor drive end housing by lightly tapping end housing with a soft mallet.
3) To separate stator from diode end housing, unsolder three negative diode leads and connections between diodes. CAUTION - If excessive temperature is allowed, diode will become inoperatie.
TESTING
Diode Assemblies - Disconnect heat sink and check each diode with tester on continuity in forward or reverse direction. If the diode shows large resistance in one direction and small resistance in other direction, diode is normal. If it shows small resistance in both directions it is shorted. If large resistance is shown in both directions, diode is open.
Field Continuity - Check continuity between field coil and slip ring. No continuity indicates broken wire; field coil must be replaced.
Field Coil Ground - Check continuity between slip ring and shaft (core). If there is continuity, coil or slip ring is grounded and must be replaced.
Stator Coil Continuity - Check continuity between leads of stator coil. If there is not continuity, coil has broken wire and must be replaced.
PARTS REPLACEMENT
Diodes - To remove diode, use a suitable tool to support heat sink and remove diode by use of a suitable
press. Press out carefully to avoid damaging mounting bore of heat sink. CAUTION - Do not strike diode as shock may damage other diodes. To install diode, support heat sink as in removal, select correct type diode (positive diodes have red markings; negative diodes have black marking), and press diode into heat sink.
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| INSTALLING DIODE |
Drive End Bearing - Remove bearing retainer by unscrewing set screws and press out bearing, using a suitable press.
Rear Bearing - Remove rear bearing from housing assembly, using a suitable press or bearing puller.
REASSEMBLY
Reassemble by reversing disassembly procedures, making sure polarity of diodes is correct.
