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V7iii engine with V7i bike - battery not charging

Discussion in 'V7/V85/V9 Chat & Tech' started by Harvey21, Jul 9, 2019.

  1. Harvey21

    Harvey21 Just got it firing!

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    Hi all,

    Long story short, I had to buy a new engine for my V7i.

    The only engine available was the V7iii and I was told that would fit and work no problem.

    The bike has been running fine but the battery is not charging correctly.

    I have isolated the problem to the regulator/rectifier. It is rectifying but not putting out the correct voltage. So I need a new one. This was tested when removed from the bike so no interfering factors.

    Do I go for a V7iii reg/rect? Could the old one (v7i reg/rect) have blown by being used with the V7iii engine?

    Dont want to buy the wrong one then have it break again so I cant return it...

    To be honest the V7iii reg/rect is cheaper online so I think this is a no brainer.

    Any advice would be greatly appreciated.
     
  2. vagrant

    vagrant High Miler GT Contributor

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    Buy the one from the store above. Guzzi u its are too inconsistent in quality.
     
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  3. Harvey21

    Harvey21 Just got it firing!

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    GT-Rx® likes this.
  4. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    I can also put the MOSFET version online that I use at my shop, that is plug and play for most 2013-2016 V7s if there is interest? If it s direct bolt on, plug matched replacement. Post below if interested.
     
  5. vagrant

    vagrant High Miler GT Contributor

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    I'd use mosfet.
     
  6. sib

    sib Cruisin' Guzzisti

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    Bear in mind that the V7(I) uses a 350W dry alternator whereas the later V7's use a 270W wet alternator. Although the wiring diagrams show identical hook-ups, the alternators have different part numbers and perhaps they differ internally. Earlier forum posts also indicate that they have different bolt hole spacings, so if you use a later alternator you may have to adapt it to the V(I) frame. Good luck.
     
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  7. Harvey21

    Harvey21 Just got it firing!

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    Hi Sib, thanks for the reply. The fact the wattage is different concerns me :oops: If I replace the rect/reg with the V7iii will the problem move into the loom and beyond because of a lower wattage input?! This is such a head ache lol. Thanks in advance
     

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