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- - Electrical issue?? (https://www.dieseltruckresource.com/forums/3rd-gen-engine-drivetrain-2007-up-114/electrical-issue-282926/)

jerryleejr

Dec 31, 2010 08:19 AM

Electrical issue??

Just wondering if anyone else has noticed this but on my 3500 DRW the fan for the heat/ac and also the head lights surge with the motor at idle, i.e. when the motor speeds up the fan speeds up and the lights get brighter, motor slows down fan slows down headlights dim. Nothing erratic very precise with the motor, Only at idle not while applying throttle.

JJ

Scubanero

Dec 31, 2010 11:18 AM

Mine does too and I don't think it is an issue. Alternaters don't put out as well at low speed. Older vehicles don't change the idle speed as much as these do so you don't see the change except when you pull away.

jerryleejr

Dec 31, 2010 04:47 PM

Good to know

JJ

NSANE

Jan 3, 2011 02:14 PM

Grid heater working maybe? Does it when cold and first started?

mega-engr

Jan 3, 2011 03:32 PM

This is all normal and it is the grid heater cycling. After 20 mpg moving the grid heater will not cycle. It will come back on if the air temperature at idle is not above a given level.

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