740 electrical: complete power loss!

Discussion in 'Volvo 740' started by Allen Lillie, Sep 1, 2004.

  1. Allen Lillie

    Allen Lillie Guest

    My 1989 740 wagon has some sort of intermittent electrical problem. I took
    a sharp left turn at about 30 mph yesterday, and midway through the turn
    everything shut down. The engine went off, the radio went off. When I
    completed the turn, the engine lights came on and I was able to restart the
    car. I lost all the presets on the radio, so I am assuming this is a fairly
    systemic loss of power.

    Has anyone heard of a problem like this? Any suggestions?

    My basic plan is to just start jiggling connections with the radio on; I
    hope to hear the static or 'click' of a bad contact. But where to start?

    Allen Lillie, Sep 1, 2004
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  2. I had a 1986 Volvo 740GL estate and I suffered a lot from intermitant
    electrical failures. The Volvo Agent I took it to (no longer a Volvo Agent)
    was worse than useless. A work colleague had a 240 with the same B23 engine
    and he told me that he had the same fault. The fault lies with the negative
    connection from the battery to the engine block where it attaches to the
    block - it is situated away down under the engine and difficult to get to,
    therefore easy to ignore. The cable is too tight a fit and with the
    movement of the engine the conductor inside the sheathing breaks thus the
    intermitant fault - make and break dependant on engine movement when
    running. You cannot see the conductor inside the sheath and taking it off
    sometimes does not reveal the fault. The remedy is very simple - I bought
    two lengths of braded earthing srap from an accessory shop and used them to
    make an earth path over the engine mountings - remove one nut at a time fit
    the new earth strap then connect to the otherside of the engine mounting. I
    did this both sides and I never had any more trouble for the 15 years that I
    had the car. Also make sure that the negative lead form teh battery to the
    bodyshell is good and if necessary add another negative lead.


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    Ken Hutchison, Sep 2, 2004
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