HCOC The Hyundai Coupe Owners Club ®And Forums

This is normal and not a fault!

Your coupe may exhibit a very brief, slight dimming of the headlamps for only a few seconds immediately after:

* The A/C compressor clutch is activated.
* The Rear Defroster is turned on.
* The HVAC fan is turned on High.
* Any other large electrical load is encountered.

In order to minimize engine RPM fluctuation, an electronic control system is utilized to gradually increase the electrical load on the generator.

This load control results in the very brief (less than 5 seconds), very slight dimming of the headlamps.

This condition does not adversely affect visibility or headlamp illumination in any manner. This condition is NORMAL and does not reflect any malfunction of the electrical system. Do not attempt to repair this condition.

Yeah happens on almosst any car. Current surge causes it, or rather a high draw of current. Never noticed the revs dip a little with aircon too?

androo 007 wrote:Yeah happens on almosst any car. Current surge causes it, or rather a high draw of current. Never noticed the revs dip a little with aircon too?

Actually, the car ticks over slightly faster with the a/c on. switch it off and revs drop slightly (Gen 3, 2 litre) though they may drop briefly at a/c switch on until the system realises and compensates.

My AC used to go from 800 at idle to about 1000-1100 RPM. No drops, no dimming headlamps. Got to be the grounding cables, me thinks.