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Cause damage or even a spark
- The positive terminal cable should never be removed because doing so could cause damage or even a spark. Instead, disconnect the cable from the negative terminal.
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What is a D+ connection on an alternator?
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What is a D+ Terminal on an alternator?
Sep 16, 2020 · Out on the road with an alternator system issue in my ‘89 auto camper. Tracked it down to the D+ exciter wire circuit, as I can jumper the B+ to the D+ and get the alternator running. But can’t figure out where the D+ is having its problems.
Jan 20, 2022 · If I short the D+ wire to the alternator case, the alternator light does not turn on. If I put the key to on, I do not see 12v on the D+ wire when I disconnect it. I didn’t check the D+ terminal on the alternator when operating at full voltage, but I’d assume I would see 12v there.
Nov 2, 2023 · The alternator exciter wire sends a signal to the voltage regulator, telling it to “wake up and start charging, buddy!” To connect this wire, you’ll usually find a convenient little terminal marked “D+” on the back of the alternator.
The rectifier assembly converts the AC current into direct current (DC) for use by the vehicle’s electrical systems. By understanding the B+, D+, and W connections in an alternator wiring diagram, you can effectively diagnose and troubleshoot any issues related to the charging system.
Jan 24, 2022 · The D+ wire from x27 to the alternator is the issue. When I bypassed it by connecting the pin 4 of the connector to the D+ terminal on the alternator, the battery light lit up no issue. Unfortunately I’m not sure how to pinpoint the break location, and I don’t want to hack up the harness.
Proper connection of the D+ wire is essential for the alternator to function correctly. If the D+ wire is not connected or is connected incorrectly, the alternator will not generate electricity, resulting in a dead battery and electrical system malfunctions.
You should not test an alternator by disconnecting the positive battery cable due to a high risk of electrocution. If you do want to quickly test your car alternator, and you are confident that you won't damage any of your car's electrical systems, you should disconnect the negative battery cable from the car battery.
