Duramax Diesels Forum Truck of the Week
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Old 11-03-2019, 06:54 AM
Marshrat Marshrat is offline
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Location: Jennings, Louisiana
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Default Remote start question

When using the remote start, does the alternator charge the batteries without the ignition being in the on position?

Thanks

Warren

Last edited by TheBac; 11-03-2019 at 03:54 PM. Reason: copied question to stereo/electronics
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Old 11-03-2019, 05:06 PM
$chultz38 $chultz38 is offline
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Yes
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Old 11-04-2019, 08:15 AM
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DAVe3283 DAVe3283 is offline
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Default

The way these trucks are wired is the alternator is hooked directly to the batteries (in the big red junction box near the power steering pump). The ECU controls the alternator, so as long as the engine is running, the ECU will command charging, even if the ignition switch is off.

You can always verify this with a multimeter. Hook the multimeter up to your battery, hold the hood sensor down so it can start, and remote start the truck. Be careful nothing gets sucked into the belt, etc. You should see the voltage come up to 13+ volts within a minute of remote starting the truck.
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Old 11-08-2019, 08:53 AM
Marshrat Marshrat is offline
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Thanks for the info.

Warren
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