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  1. #1
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    Default Volvo Md7b control panel wiring.

    Have just replaced the timber for the instrument panel. While doing this I had to disconnect the wires from the back of the panel. Putting it back together was fairly simple because the leads are clearly marked or so I thought! One thick green wire with 30 marked on one end and switch on the other. The 30 is the pin 30 on the back of the starter switch. But where is the other end marked switch go to? The wiring diagram in the manual is not that helpful! Appreciate any help.
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  2. #2
    Join Date
    Jun 2001
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    Scotland
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    Default Re: Volvo Md7b control panel wiring.

    Quote Originally Posted by fishermantwo View Post
    Have just replaced the timber for the instrument panel. While doing this I had to disconnect the wires from the back of the panel. Putting it back together was fairly simple because the leads are clearly marked or so I thought! One thick green wire with 30 marked on one end and switch on the other. The 30 is the pin 30 on the back of the starter switch. But where is the other end marked switch go to? The wiring diagram in the manual is not that helpful! Appreciate any help.
    It appears to go to Terminal B on the terminal strip adjacent to the panel then continues on to Terminal c on the alternator.

    Note there are 3 green wires and this is the thick one.
    Eastern Scotland and beyond.

  3. #3
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    Jul 2002
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    Default Re: Volvo Md7b control panel wiring.

    A bit puzzled because the diagram you have attached shows only the incoming positive , from the fuse via Teminal C, on terminal 30.

    Other green wires are the switched positive supplies to other items on the panel but coming from terminal 75.

    I think maybe you have a later panel which has an unswitched supply from terminal 30 to the "extra equipment" switch ( the diagram I am looking at though shows this as a red wire ) but you would not have needed to disconnect it to remove the panel.

    Either the wire in question is this latter one, but green) or it is a supply to a switch that is not part of the panel ( hence the need to disconnect it)

  4. #4
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    Default Re: Volvo Md7b control panel wiring.

    Quote Originally Posted by Bilgediver View Post
    It appears to go to Terminal B on the terminal strip adjacent to the panel then continues on to Terminal c on the alternator.

    Note there are 3 green wires and this is the thick one.
    I think you will find that the wire through terminal B is the connection from the alternator ( terminal 61) to the no charge warning light

    There is no terminal C on the alternator ... I think you are looking at the colour code for the wire
    Last edited by VicS; 19-07-19 at 11:15.

  5. #5
    Join Date
    Aug 2009
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    Belfast
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    1,465

    Default Re: Volvo Md7b control panel wiring.

    I have had to rewire and fit a new alternator to my son's boat with one of those engines.

    I defy anyone to interpret that wiring diagram successfully, especially the connections to the alternator.

  6. #6
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    Default Re: Volvo Md7b control panel wiring.

    Quote Originally Posted by SAMYL View Post
    I have had to rewire and fit a new alternator to my son's boat with one of those engines.

    I defy anyone to interpret that wiring diagram successfully, especially the connections to the alternator.
    It's easier if you download a pdf and enlarge it many times

  7. #7
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    Default Re: Volvo Md7b control panel wiring.

    Quote Originally Posted by VicS View Post
    A bit puzzled because the diagram you have attached shows only the incoming positive , from the fuse via Teminal C, on terminal 30.

    Other green wires are the switched positive supplies to other items on the panel but coming from terminal 75.

    I think maybe you have a later panel which has an unswitched supply from terminal 30 to the "extra equipment" switch ( the diagram I am looking at though shows this as a red wire ) but you would not have needed to disconnect it to remove the panel.

    Either the wire in question is this latter one, but green) or it is a supply to a switch that is not part of the panel ( hence the need to disconnect it)
    Thanks for the replies. The other green wires go to terminal 75 and all the green wire ends have names on them. This wire has 30 on one end and switch on the other. I'm fairly sure it came off by itself as I pulled the panel, there was only about 5 wires I had to disconnect and I sketched a mud map to ensure they went back correct. There are only two switches on the panel, two push pull units at the top. It would have been an easy job if Volvo could have supplied a decent, clear circuit diagram. The diagram is for a Md7a panel, I could not find one for a B.
    The end of the wire marked switch has a male spade as well as the female spade if that helps.

  8. #8
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    Jul 2002
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    Default Re: Volvo Md7b control panel wiring.

    Quote Originally Posted by fishermantwo View Post
    Thanks for the replies. The other green wires go to terminal 75 and all the green wire ends have names on them. This wire has 30 on one end and switch on the other. I'm fairly sure it came off by itself as I pulled the panel, there was only about 5 wires I had to disconnect and I sketched a mud map to ensure they went back correct. There are only two switches on the panel, two push pull units at the top. It would have been an easy job if Volvo could have supplied a decent, clear circuit diagram. The diagram is for a Md7a panel, I could not find one for a B.
    The end of the wire marked switch has a male spade as well as the female spade if that helps.
    There is a manual for the MD7B that you can down load from VP's website but its a horrible multilanguage thing . The wiring diagram is the same as the one you have for the MD7A and no clearer. Less useful in fact because there is less labelling and no legend.

    This diagram ( from a MD6A manual) clarifies the wiring diagram you posted but also shows dotted the wiring for a tachometer and a connection from 15 to J but that does not connect through to anything



    This diagram ( from the same manual) shows an extra wire on terminal 30 , but as a 2.5mm red wire, going to one of the pull switches ( labelled 7 in this diagram) I suspect your mystery wire is this one, but green unless the switch is already wired as in the fist diagram. ( All the labelling is different to the previous diagram )



    If not the feed to the pull switch I think I would insulate the wire, leave it disconnected and wait to see what if anything does not work.

    I am beginning to see VP wiring diagrams if I close my eyes! Good night for now.
    Last edited by VicS; 20-07-19 at 06:09.

  9. #9
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    Default Re: Volvo Md7b control panel wiring.

    Thanks VicS those diagrams are much clearer than what I had. I'm fairly sure it's a stock setup except the starter switch is upside down! Should be able to sort it now. Appreciate all your help

  10. #10
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    Default Re: Volvo Md7b control panel wiring.

    Quote Originally Posted by fishermantwo View Post
    Thanks VicS those diagrams are much clearer than what I had. I'm fairly sure it's a stock setup except the starter switch is upside down! Should be able to sort it now. Appreciate all your help
    I hope you sort this out too


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