How much voltage drop in car wiring

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URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=139772
Printed Date: May 09, 2025 at 6:49 PM

Topic: How much voltage drop in car wiring

Posted By: bikemaniac
Subject: How much voltage drop in car wiring
Date Posted: November 24, 2015 at 11:40 AM

Hi,

I am trying to troubleshoot my glow plug wiring system in my diesel car. It seems that I don't have sufficient voltage at the plugs even though the battery supplies the proper voltage.

Are there some rules of thumbs for acceptable voltage drop from the battery to the consumer (based on wiring cross sections etc etc)?

Example: If the battery has a voltage of 12,5V, is it normal to have 11,5V at the consumer (1V voltage drop)?

Lucas

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