Turn your headlights on, and your reading should be 55-60%. When this happens, the computer can turn off the alternator through the one computer output, the C circuit (white wire with a yellow stripe).This is the one circuit where the computer turns the alternator on and off. The second is power while the ignition switch is on (the black wire with a yellow stripe). Using this information, the computer controls the charging system through the C circuit. Honda CB400F A - SUPER SPORT 400 FOUR Alternator Diagram. The computer supplies approximately a 5 volt reference signal through the FR circuit to the voltage regulator. For this particular tech tip, we will be using a 1989 CRX with a 1.6l engine as an example.There are other Honda models that use similar systems, so that you can use this information when doing diagnostics by referring to the appropriate wiring diagram. It is the function of these three circuits that we will discuss.These three circuits are: The ELD input (Electric Load Detection),the FR input (Charging Rate Signal),and the C circuit output (The wire that the computer uses to turn the alternator on.). It actually functions as an ammeter. Questions? This signals the computer that the battery is fully charged and that overall electrical demand is low. If the computer detects a problem with this sensor, it will set a Code 20. Refer to diagram #1. The voltage regulator supplies an 8.5 volt (approximate) reference signal to the computer. 1986 honda civic wiring diagram auto wiring diagrams. When you plug the sensor in, the signal voltage will be pulled down depending on how much current is passing through the ELD sensor. Being unfamiliar with this system will usually lead to unnecessary parts replacement.From approximately 1988, the vehicle ‘s computer plays an important role in the charging system, and we must take its actions into account when diagnosing a charging system problem. The second of the inputs is the FR signal (blue or yellow wire, depending on the vehicle), which is the charging rate signal.This signal communicates to the computer on how hard the alternator is working to meet the total electrical needs of the vehicle, including the state of charge of the battery and any loads not directly monitored by the ELD sensor. There are five wires connected to the alternator. This signal is a digital signal that varies in pulse width according to the total load on the alternator. The fourth is the charging rate input to the ECM (the blue or yellow wire).The fifth is an output from the ECM (white with a yellow stripe).This is the control circuit that turns the alternator on through the voltage regulator. On startup, the alternator does not appear to be charging, but after several seconds it suddenly comes alive and begins to charge. When the computer grounds this signal, the alternator will stop charging, as in the case of the battery being fully charged and vehicle load demand is low. If this wire is shorted to ground, the alternator will not charge.In closing, the computer monitors the ELD and the FR signal and gets a good idea of what the electrical demand is like. The third controls the warning light (white wire with a blue stripe). Select your address # Description Price Qty; 1: COVER A, ALTERNATOR (NOT AVAILABLE) Not Available 11631-377-000 : Unavailable : 2: COVER B, ALTERNATOR Not Available 11632-333-010 : Unavailable : 3: GASKET, DYNAMO COVER … This circuit powers up the voltage regulator. There are two situations when the FR signal will not be digital. Not all of the electrical loads are monitored by the ELD sensor. Alternator wiring honda tech honda … Alternator not charging honda tech honda forum discussion, 1987 civic that will not charge honda tech honda forum, alternator plug wiring help 8th generation honda civic forum. At this point the signal will be a flat line, non pulsed voltage at approximately 1.2 volts (that is,100% duty cycle).That should be the lowest reading you should ever have if the system is functional. The computer supplies a 5 volt reference signal on the ELD signal wire (green wire with a red stripe). If you ever have worked on a Honda charging system, you may have noticed that this system operates a little bit differently from other systems as far as strategy is concerned. If you ever have worked on a Honda charging system, you may have noticed that this system operates a little bit differently from other systems as far as strategy is concerned. Honda Alternator Wiring Diagram. Add the rear defroster, and it should be 80-90%. With this amount of current, you should see approximately a 3 volt signal on the ELD signal wire. Our detailed 1995 Honda XR100R ALTERNATOR schematic diagrams make it easy to find the right OEM part the first time, whether you’re looking for individual parts or an entire assembly.
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