wondering speedometer

Discussion in 'GM Electrical Tech' started by K15 Blazer Guy, Aug 11, 2013.

  1. K15 Blazer Guy

    K15 Blazer Guy Member 2 Years 100 Posts

    my speedometer bounces when everything in the truck in turned on... headlights, plus blower motor = bouncing speedo...
    only when the truck is in motion though... could this be a wheel speed sensor?

    - - - Updated - - -

    could this also be related to the alternator output?
    as i click these things on one by one i see the voltage needle drop more and more....
    but the truck runs and drives fine. this only just started

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