1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

MALIBU V6 to V8 Engine wiring harness help

Discussion in 'Electrical' started by Buford T. JuSStice, Apr 13, 2018.

  1. Buford T. JuSStice

    Buford T. JuSStice Greasemonkey

    Joined:
    Aug 16, 2010
    Messages:
    129
    Likes Received:
    3
    Trophy Points:
    18
    I swapped out the 3.8L 231ci V6 in my Buick Century (I labeled it as a Malibu because Century isn't available) with a 6.3L 383ci V8 SBC. The wiring that was originally in the car SEEMS to be long enough to do what I need it to do but is it thick enough? There is a cable that seems to go to the starter that is two wires joined into one at the end on an eyelet, and is tee'd off at one point... that one I assume goes to the starter at the eyelet, and the tee off goes to the Passenger side of the vehicle. The tee-off has a connector that is melted, which is no big deal, I can always install a new connector and put a heat wrap around the whole thing if need be.

    There is a small cable that is about as long as the large double wire set up I mentioned, and it seems to be the trigger wire for the starter.

    The wire that goes to the alternator is pretty obvious, and is about twice as long as I need it to be thankfully, however the kit I got for the SBC has the one wire going to the firewall, and four wires coming off of it instead of just one. Are those hot on ignition so I can use them for sensors?

    The ignition wire is also much greater in length than it needs to be since well... it's pretty much right there on the firewall, whereas on the Buick V6 it's way up front.

    Other than that I don't think I even need any other wires. The wiper motor has it's own little harness and it isn't changing, the horns, headlamps and all that aren't changing either.

    Only thing I really need are GOOD battery cables. Any recommendations that are still readily available? Original Parts Group has a set but they're on back order for at least a month.
     
  2. pontiacgp

    pontiacgp Canadian Prime Minister

    Joined:
    Mar 31, 2006
    Messages:
    21,462
    Likes Received:
    2,836
    Trophy Points:
    113
    Location:
    Kitchener, Ontario
    the wire gauge for the v8 and v6 cars were no different, like you noticed it is the length of the wires is the issue. If you have a recycling yard close you could see if you can find a wiring harness for a v8. The wiring harness for the headlights won't need to be changed. There is a 7 mm bolt in the middle of the two harnesses on the back of the fuse box.
     
    • Like Like x 1
  3. timo22

    timo22 G-Body Guru

    Joined:
    Sep 10, 2012
    Messages:
    616
    Likes Received:
    484
    Trophy Points:
    63
    Location:
    St. Louis,Mo
    I'm about to wire up my Bonneville. Had the 3.8 and put a SBC in it. I know exactly what you are talking about. I tried to find a V8 harness but had no luck. I plan on fitting the harness and cutting the wires to fit. Then solder and heat shrink.
    timo22
     
  4. Buford T. JuSStice

    Buford T. JuSStice Greasemonkey

    Joined:
    Aug 16, 2010
    Messages:
    129
    Likes Received:
    3
    Trophy Points:
    18
    Well I mean, that's the thing... it doesn't seem like it's too short at all. It's long enough to go from the fuse block all the way over the passenger fender and then drape over at least six inches. My biggest issue is making sure I don't put it in a place where it'll get melted by the headers I've got for it.
     
  5. pontiacgp

    pontiacgp Canadian Prime Minister

    Joined:
    Mar 31, 2006
    Messages:
    21,462
    Likes Received:
    2,836
    Trophy Points:
    113
    Location:
    Kitchener, Ontario
    With headers I use a Ford style remote solenoid so the only wire going to the starter is the battery cable which is only live when I start the car.
     
    • Like Like x 1
  6. Buford T. JuSStice

    Buford T. JuSStice Greasemonkey

    Joined:
    Aug 16, 2010
    Messages:
    129
    Likes Received:
    3
    Trophy Points:
    18
    I might just use the stock wire and put them in a heat shield sleeve kind of like how I plan on doing with the spark plug wires.

    As for those extra wires coming off of the alternator... those are hot when the ignition is on, right? I wonder how much current they're meant to carry. If it's 5V then they'll be good for signal wires, but if they're 12V then maybe they'll be good for something else.
     
Loading...
Similar Threads - Engine wiring harness Forum Date
82 monte carlo replacement engine wiring harness???? Electrical Mar 1, 2016
tbi engine bay wiring harness question Electrical Feb 12, 2012
88 Monte Carlo Engine bay wiring Electrical Jun 28, 2013
78 cutlass engine wiring diagrams? Electrical Feb 28, 2012
Engine bay wiring Electrical Nov 7, 2010

Share This Page