Charging system

Have a 81 seca 750 battery not charging changed stator stil not charging need help

 

Check the condition of the rotor and its brushes, too:

Alternator Stator:

gp22) Aftermarket new or re-wound Alternator STATORS perfectly replace the originals. Rewound stator coils are sold on a "core charge" basis and you must return to us a usable, same-model stator core in order to receive your core charge refund. Re-wound stators will output at least the same current as an original stator, and comes with the wiring harness lead and connector but without the rubber insulator grommet that fits into the generator cover----so save your original grommet!

Checking alternator stators: the resistance across each pair (white1 to white2, white1 to white3, and white2 to white3) of the three white wires (white1, white2, and white3) at the connector should be as follows. These tests should be taken while the components are at a temperature of about 70-F:

0.50 ohms +/- 10% for all XJ550 models.

0.46 ohms +/- 10% for all XJ650, all XJ700, all XJ750, and XJ900RK models.

0.37 ohms +/- 10% for all XJ1100 models.

0.40 ohms +/- 10% for all XS1100 models.

NOTE: for best performance, your alternator Stator and Rotor (or, the Field Coil on XS1100 models) should be replaced at the same time.




Alternator Rotors and Field Coils:

gp2) OEM new and aftermarket re-wound Alternator ROTORS perfectly replace the originals. Rewound rotors are sold on a "core charge" basis and you must return to us a usable, same-model rotor core in order to receive your core charge refund. Re-wound rotors will output at least the same current as an original.

Checking alternator rotors or field coil: the resistance across the two lead wires (usually brown and green) at the connector should be as follows. Note that worn or damaged alternator brushes can affect these readings, as can "dirty" copper commutator rings on the rotor face (where the brushes contact the rotor):

4.5 ohms +/- 10% for all XJ550 models.

4.0 ohms +/- 10% for all XJ650, all XJ700, all XJ750, XJ900RK, and XJ1100 models.

3.5 ohms +/- 10% for all XS1100 models (field coil).

NOTE: for best performance, your alternator Stator and Rotor (or, the Field Coil on XS1100 models) should be replaced at the same time.



Alternator Brushes and Brush Holder Plate:

Replacing worn or oil-soaked ALTERNATOR BRUSHES is your first step towards a healthy, capable electrical system. We offer the both the brushes (individually or with their holders) or complete brush plate kits to allow you to quickly and easily fix any problems in this critical area.

Before you replace your alternator brushes, you should also check the condition of your alternator rotor and stator unit.

You can do this by following the instructions below; however, be aware that worn or dirty brushes CAN affect the resistance measurements for the ROTOR (as the rotor is what the brushes actually contact), so it may be useful to check the rotor resistance via attaching the ohmmeter test leads directly to the copper commutator strips on the rotor itself (as well as checking the resistance at the wire harness connector).

The alternator STATOR resistance tests should be taken at the wiring harness connector, although they can also be taken at the stator itself.

The factory resistance readings listed below do take into account the resistance of the wire harness leads between the component and the end of the harness lead wire; however, the wire harness resistance SHOULD BE minimal. If any out-of-spec readings are noted, it's best to take readings both at the component and then again at the end of the harness leads, and draw conclusions and follow-up procedures (i.e. cleaning the harness terminals, checking for pinched or burned wires in the harness, etc.) based on such information, and perhaps re-checking measurements after corrective actions are taken.


Checking alternator stators: the resistance across each pair (w1 to w2, w1 to w3, and w2 to w3) of the three white wires (w1, w2, and w3) at the alternator stator lead harness connector, on those three wires LEADING TO THE STATOR, should be as follows:

0.50 ohms +/- 10% for all XJ550 models.

0.46 ohms +/- 10% for all XJ650, all XJ700, all XJ750, and XJ900RK, RL, N/FN, and F models.

0.37 ohms +/- 10% for all XJ1100 models.



If all of the above check out properly, then it's either the regulaor/rectifier unit or a bad battery:

Regulator/Rectifier and Related:

er2) OEM and Aftermarket REGULATOR - RECTIFIER----this is the ribbed aluminum box with the multi-wire plug attached. Regulates the voltage from the alternator, and changes it ("rectifies")from AC to DC.

There are a number of different tests that can be performed on the regulator and rectifier unit, and it is beyond the scope of this catalog to explain in detail what those tests are, and when and how to perform them. The regulator, in particular, stands "in-between" two of the main electrical components in the entire system----the battery and the alternator----and thus performance of those components must be evaluated before a faulty regulator is suspected. We strongly suggest the purchase of a factory or aftermarket service manual for your bike to be able to properly diagnose and perform electrical system problem solving and repairs!