So I have an annoying squeak almost like a chirp. It doesn't do it while its cold just after it warms up. It's also louder while in gear. I've replaced both idler pulleys and the tensioner assembly also the belt. So before I either change the alternator or the water pump I want some opinions.

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OME 2790/2948 Rancho all around
JBA strut plates with clevis lift
2 extra rear upper isolators and one extra lower
Front sits 23
Rear sits 22 3/4
265 75 16 Maxxis Big Horn MT
GDE Hot Tune
Bumper trimming up front

Vote for alternator.

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
RL super sliders, Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.

Does the serp belt tension bounce around at a bit above idle or is it virtually steady. If the former the alternator pulley is shot.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

It bounces a lot at idle

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OME 2790/2948 Rancho all around
JBA strut plates with clevis lift
2 extra rear upper isolators and one extra lower
Front sits 23
Rear sits 22 3/4
265 75 16 Maxxis Big Horn MT
GDE Hot Tune
Bumper trimming up front

If it bounces a lot at idle (mine barely twitches) you likely have a fair amount of red "dust" on the alternator pulley cap. In any case it's probable that your alternator clutch is shot, not uncommon, and that's your squeak. The clutch itself can be replaced (IDparts has it and also has the whole alternator at a reasonable price) although I understand, never done it myself, removal of the clutch is a bit of a problem. Alternatively some have been able to source a lifetime warranty alternator from like Autozone pretty cheap (ca. $150 IIRC) or http://www.maniacelectricmotors.com/ rebuilds them or used to.

FYI don't go cheap on the clutch at some local shop, although they might could do the removal/install if you bring in the alternator and new clutch, as the cheaper "reactive" clutches won't hold up and a solid pulley replacement will do nasty things to other components associated with the serp belt.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

I manage an Oreilly Auto Parts so I get a very good price on it. There is not any dust or anything.

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OME 2790/2948 Rancho all around
JBA strut plates with clevis lift
2 extra rear upper isolators and one extra lower
Front sits 23
Rear sits 22 3/4
265 75 16 Maxxis Big Horn MT
GDE Hot Tune
Bumper trimming up front

My pulley didn't really have dust. I only determined it was the alternator after I removed the belt and spun the pulley by hand. It wobbled a lot ( no visual wobble with belt on and engine running).

I have another similar squeak that I am guessing is an idler pulley (saw one that looked like some grease might have oozed out)... for sure a different sound from before so there is a difference in sound between components failing.

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05 CRD Sport Dark Kahki

RRO: Adventure Rack/Rails ** MOPAR: Skids/Renny Flares & 255/75r17 (32.1) BFG M/T on JK wheels ** ARB: Bumper/IPF lights/790/948/shocks ** GDE: TCM/Hot Tune ** ROCKLIZARD: Super Sliders/Komodo Bumper

My Build Thread
US Army Infantry

UPDATE I installed the new alternator and the problem was fixed! Let's hope to god it doesn't come back as the chirping was really pissing me off lol.

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OME 2790/2948 Rancho all around
JBA strut plates with clevis lift
2 extra rear upper isolators and one extra lower
Front sits 23
Rear sits 22 3/4
265 75 16 Maxxis Big Horn MT
GDE Hot Tune
Bumper trimming up front

I have an annoying squeak at idle too... Much louder when in gear. I thought it sounded like it's coming from the A/C compressor clutch but maybe it's the alternator... On mine it could be anything since it was in storage next to the ocean for several months and the engine and every bolt is completely rusted.

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2006 Jeep Liberty Limited CRD (purchased 10/30/12 w/ 52k miles) GDE HotTune & Eco TCU, Suncoast TC, Amsoil Full SAPS (EFM) 5w40, Amsoil ATF, 7" touchscreen Android powered stereo (direct from China) w/ 4G LTE mobile data for streaming Netflix, HBO GO, Slingbox, Pandora, etc.