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Cal1400 Rectifier / Stator replacement

Discussion in 'Cal 1400 8V' started by Michael N, Aug 26, 2021.

  1. Michael N

    Michael N Just got it firing!

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    Hi,
    My 2014 California Custom 1400 has an electrical problem, which started when I replaced the horns (with Stebel). Even with 14V showing when the bike was running, the horns would only work occasionally. I thought it might be the battery and had one on order, but yesterday was on the freeway and wanted to test the horn - pressed the button, watched the voltage drop, and once it hit 12.7 the Urgent Service warning light came on (and now the battery is not getting charged.) I checked the fuses, but unfortunately that was not the problem.

    I read other threads (and noted the recall), but wonder whether anyone here has replaced the rectifier on their Cal1400? How about the stator? Where is the rectifier located (so I can test it.)


    Thanks!
    Michael
     
  2. kiwi dave

    kiwi dave GT Reference

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    I think the first move would be to replace the battery.
     
  3. Michael N

    Michael N Just got it firing!

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    Thanks for the quick reply. I have a new battery coming Monday, but I don't think its the problem– the current one holds a charge (I trickle charged it and it reads 12.3V) I don't think there's any power going to it from the charging system, so I was hoping to find out where the rectifier is and put a voltmeter on it.
     
  4. kiwi dave

    kiwi dave GT Reference

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    My memory is fading me, but I think the rectifier built into the generator. It's called a generator in the parts manual, possibly because if the rectifier wasn't included it would be called an alternator. Seems logical?

    Unfortunately, I don't have any of my two Cali 1400 customs at home with me, and we are currently in Covid lockdown.
     
  5. Michael N

    Michael N Just got it firing!

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    Wow! Your memory is good. The local dealer (in San Francisco, who unfortunately are not skillful) got back to me with parts availability, and mentioned that they searched and searched and couldn't find a rectifier in the microfiche. They said they could order a generator (which takes 2+ weeks), and it wasn't a ton of money, but in the meantime I'll try to test the power at the alternator connection... The fact that the MG manual shows an "alternator connection" to the engine is strange (insofar as its not technically an alternator, as you point out.)

    It looks like the generator is between the two cylinders - has anyone here replaced one?
     
  6. kiwi dave

    kiwi dave GT Reference

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    I'd just wait until the battery turns up. It might solve all of your issues.
     
  7. Michael N

    Michael N Just got it firing!

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    Thanks Dave. From your mouth to G-ds, ears ;).
    Unfortunately, I think the new battery is an unlikely solution. When the problem hit yesterday, the bike showed the battery was at 11.8V (instead of the usual 13.7-14V when the charging system is working.) I had to drive over 40 miles, watching the voltage drop as it powered the engine... I made it home with only 8.4V left (it was a miracle it ran - ABS and MGTC lights went on when the voltage dropped below 10. Last night I trickle charged the battery, and its hold a charge (back above 12V), so there doesn't seem to be anything wrong with the battery system ;(.

    Im just looking for illustrations of how to remove the tank... this forum had some conflicting instructions (including having to remove the eagle medallion, which seems weird.)

    Thank you for your help!
     
  8. GTM®

    GTM® Administrator Staff Member GT di Razza Pura

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    Hi Michael. Welcome to the GT Forum. I will encourage you to read the two paragraphs in red above, use the search function and read. ALL of your questions are well answered here. This is a self help website, and many here actually professionally wrench Guzzis daily and are happy to help, but know it's not our job to assist you when the info has been already posted many times over.

    I'll help you a little as a welcome... the voltage regulator lives on the back of the alternator, it's about $30. You do not need to pull the tank side panels to remove the tank.

    Best to you on figuring it out, but do listen to what those who post say, including Dave above. Again, search and read... OR ignore me like many others do here. This is my website, and I have 20+ years in exclusively wrenching, racing and building Guzzis, including the custom BUILDs linked above. Enjoy. ;)
     
  9. James Chance

    James Chance Cruisin' Guzzisti

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    If it won't hold a higher voltage than that after a 24 charge (trickle or not), the battery has a problem. The charging system may have contributed, but if the battery won't recover, then... IMO of course. Good Luck with it...
     
  10. V700Steve

    V700Steve GT Reference GT di Razza Pura

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    Just an idea but have you disconnected the horn to see if problem goes away? You said it started after install, maybe the horn is the issue. Is it connected w/separate relay?
     
    GTM® likes this.
  11. Moto-Uno

    Moto-Uno Cruisin' Guzzisti

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    As was mentioned earlier the regulator,rectifier is mounted to the back of the alternator . It's sorta accessible with the
    tank removed . At $30 bucks to replace it , it 's probably worth a try . But should it be the alternator , you've got one
    significant job ahead of you . The voltage drops you experienced I doubt could be caused by the horns (unless you hard wired
    them to the battery without a fuse and they shorted out ) . I don't know anything about the earlier 1400 wiring recall . Peter
     
  12. Matt Russell

    Matt Russell Just got it firing!

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    I am not sure if things changed but every bike I have put on a stebel on I have to run a relay to it.
     
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  13. Michael N

    Michael N Just got it firing!

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    Thanks. We pulled the rectifier and it seemed faulty (the diode showed current flow in both directions), but this may or may not be an accurate test. I think we sourced a new rectifier (MG says they are not replaceable, but they look like this one (which also works on tractors)-
    amfindustrialusa.com/i-30508267-new-voltage-regulator-for-denso-alternators-in255.html

    I got lucky and found a used Generator on eBay cheap that is arriving Thursday - I'll swap that rectifier with mine.
    Fingers crossed it works - I do not want to have to drop the engine, etc. and the mechanics in my area are no more experienced than I am. I had been driving BMWs for a few decades, never with a problem! This is HD level nonsense (I had a shovel head in the 80s - this MG reminds me of that bike...)

    Thank you for all the help
     
  14. Michael N

    Michael N Just got it firing!

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    Yes, when I reinstall everything, I will definitely be running a new lead to the horns (and use the relay). A few people on this forum had said it would work plug and play, but that hasn't been my experience.
     
  15. Moto-Uno

    Moto-Uno Cruisin' Guzzisti

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    ^^ Ouch , I worked on HD at dealerships then , and I'm not sure this is that bad . But , it is
    kinda ironic that Guzzi went for these rather inexpensive chinese alternators !
     
    John L likes this.
  16. John L

    John L Cruisin' Guzzisti GT Famiglia

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    and starter motors.
     
  17. Michael N

    Michael N Just got it firing!

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    No joy. I installed a new battery and replaced the rectifier on the generator and it still doesn't work. I didn't install the horn or any accessories. The bike still shows the Hazard Triangle and SERVICE message. It seems weird that it did before I even fired up the bike - how would it know if the rectifier were still defective. I searched the forum for codes to reset the computer (I only saw the one for the wrench coupon.) I'll search the forum again and, more importantly, for any qualified mechanics in the SF Bay Area!
     
  18. Matt Russell

    Matt Russell Just got it firing!

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    The fact that the horn was run without a relay it may have burnt up some wires somewhere along the line. Those horns do draw significantly more amperage than the stock horns.
     
  19. John L

    John L Cruisin' Guzzisti GT Famiglia

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    Just a thought, what mileage has it done, could it possibly be a snapped alternator belt?
     
  20. Michael N

    Michael N Just got it firing!

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    Hi. Yesterday we pulled it apart again, and
    Hi,
    Interesting thought. When I tested it yesterday we measured the AC power from the generator (stator) - there was none ;(. I did see the shaft turning, so the alternator belt is likely not the culprit.

    Today I'm calling shops in California to see if anyone is familiar with the bike. I am supremely bummed. My local dealer (Munroe Motors) had a mechanic (Brian) who was recommended to me, but he apparently quit last month to work for the post office.
     
    John L likes this.

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