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10-14-2014, 08:59 AM
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AL129x Alternator Ripple
Hi All,
What kind of AC ripple are you guys getting off this alternator? I've got the AL129x alternator in both my 420SEL and 300SD. I measured my 420SEL at the radio connector and found that there was about 425-460 mV of AC coming out of the alternator. I've not had a chance to measure the 300SD. I did measure my 300D which has the 150A alternator (cant remember the number on it). It has less than 70mV of AC ripple. I am wondering if one of the diodes is going out on the AL129x. I'll have to put a scope on the output and see when I get a chance..
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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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