'95 Deville 4.9 failing under electrical load.
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1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, '95 Deville 4.9 failing under electrical load. in Past Cadillac Vehicle Discussion; My '95 Deville 4.9 is stalling out under maximum electrical load---headlights on,power windows being used,rear defogger on etc. This had ...
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    pompste is offline Cadillac Owners Connoisseur
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    '95 Deville 4.9 failing under electrical load.

    My '95 Deville 4.9 is stalling out under maximum electrical load---headlights on,power windows being used,rear defogger on etc.
    This had been going on before so i had a new battery and a new AC/DELCO alternator installed 3 weeks ago,after getting the old ones tested first.After getting those installed everything was good and could handle all maximum electrical loads,until yesterday when it stalled out when i used a power window.
    I`ve been looking at the voltage reading on the dash display and it IS charging.Before starting it reads usually 12.0 v or so and after starting it goes up to 13.7 v or so.
    No codes at all.
    Any suggestions?

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    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    12.0 is very low, essentially dead. Have you inspected the cables, grounds and terminals?

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    Re: '95 Deville 4.9 failing under electrical load.

    but don't overlook the possibility of getting a bad battery or alternator.

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    pompste is offline Cadillac Owners Connoisseur
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    Re: '95 Deville 4.9 failing under electrical load.

    Quote Originally Posted by MoistCabbage View Post
    12.0 is very low, essentially dead. Have you inspected the cables, grounds and terminals?
    What should the voltage read when cold "before" starting?

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    MoistCabbage's Avatar
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    A healthy, fully charged battery will put out 12.6 volts.

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    Re: '95 Deville 4.9 failing under electrical load.

    Quote Originally Posted by pompste View Post
    What should the voltage read when cold "before" starting?
    ....
    Attached Images

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    pompste is offline Cadillac Owners Connoisseur
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    Re: '95 Deville 4.9 failing under electrical load.

    Had it checked by my local trusted Meineke mechanic the other day.He tested new battery and new alternator and both checked ok.
    He then checked all the "grounds" and found a loose ground attached to the engine.According to him, because of the loose ground attached to engine,it was trying to find a ground though the "body" which explained the super hot ground wire that comes off one of the battery cables--it got so hot under max electrical load that it was melting its coating.They always let me watch what they`re doing when working on my cars here so i know what`s really going on.
    After he really tightly secured the loose engine ground and we then ran max electrical loads,the battery ground wire cooled to normal and it handles all max loads now.
    So if anyone else ever has a similar problem as this,be sure to check all "grounds".
    He spent about an hour on it and best of all---he did it for free---a rarity these days.

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