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GM B-Body Forum, 77-79 Caprice/Impala Forum

A forum for all the owners and enthusiasts of General Motors B-Bodies from 1965-1996, but dedicated to the owners of 1977-1979 Impalas and Caprices. Join up now!


    ignition issues 78 impala

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    thotrodder
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    ignition issues 78 impala Empty ignition issues 78 impala

    Post  thotrodder on Mon Sep 30, 2019 6:56 pm

    My daughters boyfriend hooked up jumper cables wrong and tried to start the car. It burned 2 wires to the starter and the starter. I replaced starter, alternator and ignition switch. The car will start but it wont stay running. There is no power in the run position to anything but when i turn all the way to start it starts but stops as soon as i let go of the switch. I tested power and i have power to my ignition circuit when its in start position but not in the run position. Any help would be appreciated im at a dead end. I have a manual for it but it just gives you the basic ignition circuit and not a detail of the what holds the run position.
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    ignition issues 78 impala Empty Re: ignition issues 78 impala

    Post  GM B-Body Forum on Mon Sep 30, 2019 9:51 pm

    Sounds to me the ignition switch itself was fried. However there are fusible links along the main harness. I had an issue a few years ago on my 79, got no power to anything. I completely rewired it and removed all the fusible link, and installed a 250 amp mega fuse right off the battery. I have the full wiring diagram for these cars, they're posted on here too.


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    1979 Caprice Sport Coupe, 400hp Vortec 350, Th350, GM 8.5 w/disc brakes, 3.90 gears Detroit Truetrac, 2.5" stainless duals w/ x-pipe, Dynomax race bullets.
    1984 Caprice Sedan, 305 motor, 700r4
    1978 Caprice Sedan, 305 motor, th350
    1993 L99 Caprice, 4.3 v8, 4l60 trans
    1972 Ford F-100, 302 windsor, c4 trans
    2001 BMW E46 330i, 3.0L
    ignition issues 78 impala 20150410
    GM B-Body Forum
    GM B-Body Forum
    Admin

    Posts : 747
    Join date : 2013-01-14
    Age : 27
    Location : Flint/Detroit, MI - Charlotte, NC

    ignition issues 78 impala Empty Re: ignition issues 78 impala

    Post  GM B-Body Forum on Mon Sep 30, 2019 9:54 pm

    I think im misreading your post. You checked power right at the pink plug on the distributor? If so thats directly from the ignition switch, meaning the switch is bad if your only getting power in start position.


    _________________
    1979 Caprice Sport Coupe, 400hp Vortec 350, Th350, GM 8.5 w/disc brakes, 3.90 gears Detroit Truetrac, 2.5" stainless duals w/ x-pipe, Dynomax race bullets.
    1984 Caprice Sedan, 305 motor, 700r4
    1978 Caprice Sedan, 305 motor, th350
    1993 L99 Caprice, 4.3 v8, 4l60 trans
    1972 Ford F-100, 302 windsor, c4 trans
    2001 BMW E46 330i, 3.0L
    ignition issues 78 impala 20150410
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    thotrodder
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    Posts : 3
    Join date : 2016-10-17

    ignition issues 78 impala Empty ignition switch

    Post  thotrodder on Tue Oct 01, 2019 5:29 am

    I replaced the ignition switch already. Yes i only get power when the switch is in the start position.

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