My friends 05 CRD is having a weird charging issue. While driving the lights will start to pulse brighter and dimmer around 2,000 rpms and up. I tested the battery and the alternator. All checked out well and stayed in the 14 volt range. That was with the vehicle stationery. Torque pro app shows it going up into the 16 volt range while driving only. I did use the search engine and couldn't find the same problem. Has anyone else experienced this that might lead my in the right direction.

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06 Liberty CRD--cheap lift and a Magniflow
04 Expedition--5.4L 4x4 Eddie Bauer
90 Bronco--5.0L another Eddie Bauer
81 Austin Mini--automatic, 1 liter of raw power
69 Cougar--398" of pure torque, when it ran

Electrical issues are allways a PITA, have you tried checking the voltage off of the Alternator?

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2005 CRD 2.8L
GDE Eco Tuned
Weeks Stage 1+2
Suncoast Torque Converter
2.5" custom OME/JBA lift
Kennedy Lift Pump
Racor 245R122 fuel filter system
Model 001 Thermostat 41603
Iron Rock Tri-link

you need a new voltage regulator

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U.S. Army Retired

https://www.ebay.com/itm/271528729422

This is what I used to fix my alternator.
My headlights were pulsing at any rpm above idle.
Although I could never verify if it was overcharging.

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U.S. Army Retired

Thanks guys!
I'll order it tomorrow when I get paid.

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06 Liberty CRD--cheap lift and a Magniflow
04 Expedition--5.4L 4x4 Eddie Bauer
90 Bronco--5.0L another Eddie Bauer
81 Austin Mini--automatic, 1 liter of raw power
69 Cougar--398" of pure torque, when it ran