Glow plug power

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Hi have installed a auxiliary battery and standalone Glow plug relay with another timer relay. A thick 12v live and negative cables from the Auxiliary battery.
But still when Glow plugs are glowing voltage drops to 10.6 - 10.8 the max from 12.7v. Chassis earth wasn't a issue but I have cleaned the earth points on a safe side. I guess I have to live with that voltage output. Maybe OEM glow plugs draws less voltage but I am going to leave it alone for the time being as glow plugs are working. I want to thank you all for your guidance. ❤️
 
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