A friend of mine recently acquired a 2004 Kompressor & doesn't have much cash and asked to borrow some torx sockets as the alternator is not charging. Diagnosis was done with a machine at the McParts store.

I can give him some tools & have the alternator bench tested. Is there an external voltage regulator that goes bad? If so, where is it located? If not, how is charging controlled in that car?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

The alternator is controlled by the engine control module. The blue wire is not the field but a serial communication link with the module. There are not any easy tests other than alt output. Almost always the alt is the culprit. Beware of cheapo parts store replacements, rarely are they up to snuff.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff