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#16
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Update
Battery readings Idle: +13.68V 2000RPM: +13.88V Idle & Heater (full on): +12.44V Idle & Heater & Headlights & Fog lights: +11.99V and dropping Neg. terminal and alt. housing/engine block: -0.01V Pos. terminal and alt. housing/engine block: +13.68V Belt tension indicator shows correct tension; could a slight variation in belt tension or a frozen tensioner cause such a huge drop in alternator performance? |
#17
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It might be worthwhile to charge the battery with a charger. Then load test the battery. One year old battery may not up to the demand even with a good alternator.
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#18
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Did you ever do the test that platt-deutsch explained? That is an important one. You need to do that.
__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra |
#19
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TOPGUN: Do you have a valid procedure for a battery load test? Haven't done one. What would be the proper discharge rate for the battery for a given load? The battery has been placed on the charger overnight twice at the 12V-2A setting to a full charge at 12V.
MPOLI: I followed the testing procedure from PLATT-DEUTSCH at 2,000 RPM. Is there a more suitable RPM for a fast idle? 1,500? What about the tensioner issue? Can anyone comment on... "Belt tension indicator shows correct tension; could a slight variation in belt tension or a frozen tensioner cause such a huge drop in alternator performance?" |
#20
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James Dean:
Thanks for the suggestion. I will check the idiot light circuit. Have you seen any specific instances where there was leakage current in that circuit? If so wouldn't it drain the battery overnight... probably not since you would have to have the key in the AC position to energize the circuit. |
#21
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I would have a reputable shop test the battery. I am not sure about a 2 amp overnight charge. I think all the good ideas have already been posted.
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#22
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From the numbers you posted in post #16, you could have a bad battery, a belt tension problem, or a wiring problem in the positive circuit.
If you could check the voltage from the positive output of the alternator (at the alternator) to the case of the alternator at 2000+/- RPM, under load. This will give a better idea of the health of the alternator/belt. I agree with the bigger alternator (I have a 115A on my 500) but your car has made it for many years with an original alternator and it should continue if every thing else is ok. Get the above reading and we can go from there. Paul
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84 500 SEL (307,xxx miles) |
#23
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Update...
Replaced Alternator & Voltage Regulator again. This time, it's a Bosch VR on the stock 70-amp Alt. Same voltages as before BUT there is no light flicker anymore either at idle nor at speed. I'm keeping my fingers crossed and thinking that the Bosch VR did the trick. Nevertheless, can anybody give me some points of contact to getting the higher output alternators? The one's I have found require changing out the wiring harness and I can't seem to find it anywhere. Does anyone know of a direct fit HO alternative? Thanks again guys. |
#24
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You've got a few options:
143 AMP: BOSCH AL0162X 150 AMP: BOSCH AL0785X 1) Source Used 2) Buy from Ebay (what I did) http://www.ebay.com/itm/NEW-143A-ALTERNATOR-MERCEDES-BENZ-CL600-S600-SL600-S420-S500-SL500-009-154-51-02-/400405985019?pt=Motors_Car_Truck_Parts_Accessories&hash=item5d3a0e76fb&vxp=mtr New Mercedes ML430 Alternator V8 4 3L 99 2000 01 150Amp | eBay 3) Buy from local auto parts store/online store. You will need to update the wiring harness. You can get a used harness from a car that had one of the higher output alternators OR All you need to do is buy 7-10 feet of thick cable and install it yourself. Pretty easy to do. Here is some additional information: Installed a 143A alternator in my W124 (86-95E-class) - with photos
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#25
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Are all the pulley diameters the same on all these alternators? Too large a pulley can cause low output.
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#26
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Quote:
Have not had any problems. Initially I did not do this on my 190E, I used what the new alt came with, which was the wrong offset, causing my belt to chirp. So, I believe when installing these bigger alts one should swap the pulley from the original alternator.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#27
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Quote:
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#28
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Quote:
The m103 pulley is a bit larger than what came on the alternator. Like I said, I've not had any problems with the alt. Its been installed since 08-09 I think. I put the proper pulley (shiny black one) on about a year ago.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#29
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Who ever supplied the alternator should have supplied the correct pulley for THAT alternator in that application, or they goofed up. Assuming they claim that unit fits that app. Aftermarket parts is a jungle
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#30
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Quote:
The 115A alt that I put on my M116 came with no pulley. It was bought at AutoZone. The parts listing said you should keep and use your old pulley.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
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