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      • D+ is the battery connector. D+ is the positive connection. D is the negative connection. You can see this symbol on European alternators. They associate D+ with the indicator light circuit. Some alternators use ‘61’ instead of D+. The letters, which stand for ‘Digital Field Monitor,’ refer to a connection to the ECU of a vehicle.
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  2. Apr 25, 2021 · D+ is for the exciter, alternator dash signal light and voltage regulator circuit. This must also be showing 12.5 volts when the engine is not running, but the ignition switch is on. If it is not 12.5 volts, then the battery may be flat, and the light will come on when the alternator is running. What is a D+ signal?

  3. Feb 18, 2017 · The way I understand the setup, D+ measures the voltage at the battery, and the delta between that and the preset voltage in the regulator drives the field to increase/decrease the output of the generator. I know why you need the diodes to charge the batteries, but why would you put the rectified current on the D+ sensor line.

  4. D+ is the battery connector. D+ is the positive connection. D is the negative connection. You can see this symbol on European alternators. They associate D+ with the indicator light circuit. Some alternators use ‘61’ instead of D+. DFM The letters, which stand for ‘Digital Field Monitor,’ refer to a connection to the ECU of a vehicle.

  5. The D+ wire Is the positive voltage wire to the alternator's regulator through the ignition switch, which also energizes the charging light, via the ECM in new cars. Disconnecting this may may have many consequences and advised not to try it. Stephen Steinhauer Author has 899 answers and 579.4K answer views 2 y Related

  6. Oct 27, 2020 · The D+ signal wire is used as an on and off switch for these devices, its main purpose is to send a 12V+ signal to the device when the vehicle is running. This is necessary for devices without a voltage-sensitive relay (VSR) so the unit knows to turn on when the alternator is running and off when it is not, so it does not drain the starter battery.