Charging System Identification

While this guide is by no means complete, it should cover about 95% of the charging systems used on the older Wisconsin one, two and four cylinder engines up to the current type. Use the pics and information below to help determine what style you have. Most modules have the part # on the decal unless it has been removed. The part # always starts with "YJ".

Note: Flywheel casting #'s may have been super ceded many times over. If you don't have a model and spec # of the engine the casting # of the flywheel helps us a great deal in determining what system you have. The casting #'s usually start with the letter "N" or "NC". Also a lot of engines may have had the module and stator wire connectors cut off and the wires joined together by butt connecters.

10 amp system used on engine models AENL, THD, TJD, VE4D, VF4D, VH4D, VG4D

Very early style 10 amp system. Rectangular black box screws on to tinwork with short pigtail and connector which clips into stator through matching connector.The casting # on the flywheel is usually N1045, N1025, N1016, or N1005. This system can be on engines built in the 50's and 60's.
 

 

30 amp system used on engine models AGND, THD, TJD, VE4D, VF4D, VH4D, VG4D

Very early style 30 amp system. Square black box with plates bolted together as a heat sink. Stator wires have ring terminals which are attached to the regulator / rectifier module by nuts and lock washers. The casting # of the flywheel is usually N103, N102, N101, N100. This system can be on engines built in the 50's and 60's.
 

30 amp system used on engine models AGND, THD, TJD, VE4D, VF4D, VH4D, VG4D

Very early style 30 amp system. Square black box with plates bolted together as a heat sink. Stator wires have ring terminals which are attached to the regulator / rectifier module by nuts and lock washers. The casting # of the flywheel is usually N103, N102, N101, N100. This system can be on engines built in the 50's and 60's.

10 and 30 amp system used on engine models AENL, AGND, S10 & 12D (10a only), THD, TJD, VE4D, VF4D, VH4D, VG4D.

This system uses two separate rectangular modules, both have two wires. Note the color coding on the module on the module right. The 10 a system has a red and white wire, the 30 a system has a red and black wire. Also the 10a stator is 3/8" thick while the 30a is 5/8" thick.The casting # o the flywheel for the 10a system is N1045, N1035, N1052, N1025, N1016, or N1005. The 30a system flywheel #'s are N1049, N1039, N1029, N10110, or N1009. This type of charging system was common in the 60's, 70's and 80's.

10 and 25 amp system used on engine models AENL, AGND, S10,12 &14D, THD, TJD, VE4D, VF4D, VH4D, W4-1770, VG4D. Starting with engine serial # 5188288.

This system uses two separate rectangular modules, the rectifier has three wires and the regulator has two wires. The 10a stator is 3/8" thick while the 30a is 5/8" thick.The casting # on the flywheel for the 10a system is N1045, N1035, N1052, N1025, N1016, or N1005. The 30a system flywheel #'s are N1049, N1039, N105A3, N1029, N10110, or N1009. This type of charging system was common in the 80's and 90's.
 

 
30 amp system currently used on engine models THD, TJD, VH4D, W4-1770, VG4D

This type of charging system uses a rectangular shaped combination regulator/rectifier and is easily identified by the cooling aluminum fins which are inserted into the cooling air flow of the engine through the blower shrouding. It is held on to the tinwork by two bolts and the three wires of the stator clip on to the three spade terminals on the module. You can replace the 2 & 3 wire system shown directly above with this type but both the stator and modules need to be replaced. You can re-use the old flywheel. This system was introduced in the 90's and is used in current engine production.
 

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Copyright (2003) WMC  Last updated 04-29-05