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Alternator Plug and B+ terminal910 viewsPictured is the rear of the older Land Rover part # YLE500190 alternator showing the shiny cooling fin of the Regitar VRH2005-142 regulator under.
The first pin in the far left side of the connector is numbered #1 in the LR electrical wiring diagrams and is Battery Voltage Sensing (BVS); the middle pin, #2 receives a Pulse Width Modulated (PWM) signal from the Engine Control Module (ECM), and the right pin, #3 carries a PWM signal back to the ECM. Terminal Pin #2 on the LR wiring diagrams is called Alternator Control or ALT CON; Pin #3 per LR is called Alternator Monitoring or ALT MON.
Pin #1 is similar to what in older designs used to be called A or Batt, but is now called by Denso, S, AS, or Alternator Sensing for this design. Pin #1 also provides power to excite the alternator at startup until the PWM instructions over ride the battery voltage info. Land Rover calls the electronics under the pins a Smart Regulator, ironic, as it has to follow orders from the ECM rather than give the orders - new age thinking I guess. This is different from older design internal regulators that look at just the battery or the electrical buss voltage and then decides itself what to do.
It is almost like we are back to the external regulator designs of old, except that the ECM may decide that instead of telling the alternator to make more power, to load shed, and hence shut down the heated windscreen, seats, or whatever other electrical loads it decides are appropriate. My view is that the "smarts" are in the ECM and that the "regulator" should be regarded if not dumb, then as being a slave to the ECM.
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Thread upload9 viewsImage uploaded in thread 121110
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Denso Satnav, audio and MOST 27 views
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Denso Bearing Change95 views
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LR3 Denso Alternator YLE500390 pulley view817 viewsNote the DENSO sticker on the side. Denso calls their nominal 150 amp 12 Volt alternator an SC2 design. SC means Segment Conductor which apparently increase the winding density of the stator coil, hence yielding a physically smaller lighter alternator for a given output. I presume the 2 means the second try at getting it right. A Denso part number is 4280003690 for the alternator, (there are others, as below).
Rotation is clockwise and the 54mm diameter pulley has 6 grooves (PV6x54). Count the pulley grooves on both the one you remove and your new one - some replacement alternators seem to ship with 5 or 7 grooves so you might be swapping pulleys.
A previous LR part number was YLE500190 for the older variation of the newer YLE500390 unit.
An additional part number for a factory rebuilt is Nippon Denso 210-0569 for the petrol V8 alternator. Other Nippon Denso numbers include 104210-3690 and 104210-3691. The Lester number is 11206 which relates to another Denso number of 290-5287. WAI uses 11206N.
From 2006 to 2009, the internal regulator is a Transpo IN6349 and of the B circuit type if it can be said that applies to PWM, (Pulse Width Modulated), regulators.
The "regulator" inside the alternator is therefore really not a regulator in the old sense of the term but instead an instruction receiver from the ECM that translates Pulse Width Modulated (PWM) signals into a form that the alternator understands – digital like signals from the Engine Control Module(ECM) into analogue like signals that the windings understand.
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LR3 Denso Alternator YLE500390 rear view705 viewsThis picture shows the rear of the YLE500390, the Land Rover part number for a newer design alternator utilizing the Transpo IN6349 regulator with the "hidden" cooling fins. Note the visual difference in the rear view of the next file jpg.
If the alternator is a rebuilt, (service exchange unit), but Land Rover supplied, then the part number is LR008860 or similar. (Note that 0 in LR0 is zero.)
Two Denso part numbers exist for the alternator as well, 4280003690 and 4280003691. The rating of the petrol V8 alternator is nominal 12 VDC and 150 amps. In normal day to day operation, they seem to run about 14VDC - usually between 13.9 and 14.1 volts at the OBD port.
For the petrol V6, the LR service exchange number is LR008862, and the 2.7TDV6 is LR008861.
The bridge rectifier within the alternator is a 12 diode avalanche type, 117mm diameter, as used in Nippondenso 120 to 160 amp alternators with the Hair Pin stator. It is similar to a Transpo INR421 which is rated for 120 to 150 amp alternators. That is probably our primary problem - the rectifier is just too light. Alternate part numbers for the bridge rectifier are Cargo 237607, Mobiltron RM-29 and AS ARC6021.
Re the B+ stud, the INR421 calls it up as an M8 x 1.25 x 30 mm long course threaded stud; some say 34 mm but that may be longer than desirable.
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How to Change the Diode Pack127 views
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