Low voltage starboard side

YYZRCYYZRC Member Posts: 5,416 ✭✭✭✭✭
in Electrical Discussions
Isolator is new ProIsoCharge. Batteries are two year old AGM group 29. 

VV reads 14.2v port, 11.8 starboard when engines running. Voltmeter on starboard battery (disconnected) reads 12.6v. I swapped batteries port to starboard, no change. I swapped alternators port to starboard, no change. 

Now stumped. Thoughts?
2006 390 EC
2008 350 EC
Georgian Bay
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Comments

  • GrahamuGrahamu Member Posts: 921 ✭✭✭
    What are the voltages at the isolator alternator input terminals
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  • davidbrooksdavidbrooks Member Posts: 1,431 ✭✭✭✭
    I would be checking each wire then. Test the wires and terminals.
    It's 5 O'Clock Somewhere!
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  • GMSLITHOGMSLITHO Member Posts: 1,618 ✭✭✭✭
    behind the panel where you switch from battery 1 or 2 or both there are 2 big 30 amp fuses .I had the same issue last year 
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  • YYZRCYYZRC Member Posts: 5,416 ✭✭✭✭✭
    edited July 2021
    Thanks @GMSLITHO - my boat has the remote battery switches like this:



    I will check the breakers!
    2006 390 EC
    2008 350 EC
    Georgian Bay
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  • GMSLITHOGMSLITHO Member Posts: 1,618 ✭✭✭✭
    Ok I didn't have those  mine was a manual switch 
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  • YYZRCYYZRC Member Posts: 5,416 ✭✭✭✭✭
    edited July 2021
    More testing. 

    Engine running, starboard alternator 16.4v, port 14.6v

    Engine and battery charger off, starboard battery 12.4v, port 13.4v

    At the isolator, starboard battery 1.8v, port 12.7v

    Will now swap the charging breakers to see if that’s the issue. 


    2006 390 EC
    2008 350 EC
    Georgian Bay
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  • YYZRCYYZRC Member Posts: 5,416 ✭✭✭✭✭
    edited July 2021
    Found it. Loose nut on the starboard breaker. 

    Check your nuts!! 7/16”




    Post edited by YYZRC on
    2006 390 EC
    2008 350 EC
    Georgian Bay
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  • aero3113aero3113 Member Posts: 9,774 ✭✭✭✭✭
    Nice find @YYZRC !!
    2008 330EC
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  • pcmpetepcmpete Member Posts: 114 ✭✭
    Good find, where is the breaker located?  I need to check my nuts too.
    I have the same remote battery switch setup.
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  • YYZRCYYZRC Member Posts: 5,416 ✭✭✭✭✭
    They’re in the panel behind the transom door. 
    2006 390 EC
    2008 350 EC
    Georgian Bay
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  • pcmpetepcmpete Member Posts: 114 ✭✭
    YYZRC said:
    They’re in the panel behind the transom door. 

    Did you open the panel, or gain access from bilge?

    Thanks
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  • YYZRCYYZRC Member Posts: 5,416 ✭✭✭✭✭
    I just removed the 8 or so screws that hold the entire panel in place. 
    2006 390 EC
    2008 350 EC
    Georgian Bay
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  • pcmpetepcmpete Member Posts: 114 ✭✭


    Is that your normal voltage at idle. Mine always sits around 12.9v-13.1v which always 'feels' low to me.
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  • kordokordo Member Posts: 247 ✭✭
    Anyone know the part number for the emergency start switch shown in the pic posted earlier in this thread (from YYZRC)?  Thanks.
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  • YYZRCYYZRC Member Posts: 5,416 ✭✭✭✭✭
    Pretty sure they are discontinued but here is an example with product number:

    https://maxmarineoutlet.com/product/bep-marine-electric-battery-switch-300a-722-ne-300a-oem/
    2006 390 EC
    2008 350 EC
    Georgian Bay
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  • kordokordo Member Posts: 247 ✭✭
    Thanks YYZRC, but it's the switch by the portside door that you press to combine the starting batteries when one battery is dead.  It's between the remote port and starboard battery switch.  Your pic from July 2021 in this thread shows it clearly.  Thanks.
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  • YYZRCYYZRC Member Posts: 5,416 ✭✭✭✭✭
    edited June 2024
    Oh just the rocker switch? It’s just a Carling momentary on. Push it out from the back and see how many posts are on it. 

    Post edited by YYZRC on
    2006 390 EC
    2008 350 EC
    Georgian Bay
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