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Need help with wiring on lawn tractor

Discussion in 'Mechanic and Repair' started by AndrewFH, Mar 30, 2005.

  1. AndrewFH

    AndrewFH LawnSite Member
    Messages: 1

    I have a Sears 42" riding mower with a 16HP Briggs &
    Stratton engine. Last fall it threw a rod and the
    engine is not repairable.
    I have gotten a 14.5 HP Briggs & Stratton engine and
    am in the process of replacing the 16HP engine.
    Unfortunately the guy I had look at the mower when it
    first broke down removed and tore down the engine, but
    did not put it back together or back on the mower (not
    that I expected him to). He simply put all the parts
    in a box and gave it to me. I can't get in touch with
    him now (he's gone out of business) so can't go to him
    with my question.
    The 14.5 engine is an older model, although I am not
    sure how old. I'll add both model numbers below so if
    you need them they'll be there.
    It seems to fit okay, although I am having to make
    some minor mods (such as the muffler which will not
    fit right on my frame). However, I am not certain of
    the wiring and since I did not remove the old engine I
    can't compare that.
    The 14.5 engine has four wires on it (two sets of two
    wires each with plugs on the ends). There is a black
    and white set. The white wire attaches to something
    under the carb (looks like an electronic part), there
    is also a black wire attached to this part which is
    grounded to the block. The black wire coming from the
    plug seems to run up past the card and up under the
    cover (perhaps to the flywheel area). The second wire
    set is on the other side of the engine. It has a red
    and black wire which run up under the cover. The other
    end has a plug and there is a slight bulge in the red
    wire just before the plug which I understand is a
    diode (I think).
    There are four wires coming from my key switch. There
    is a red & orange set and a black & blue set. They
    both end with plugs.
    If I connect the plugs up just as they are wired (male
    to female) I end up with:
    1) red & orange plug from the key attached to the red
    & black plug from the engine
    2) blue & black plug from the ket attached to the
    black & white plug from the engine.

    There is also a thick red cable which I assume goes to
    the starter.

    Before I hook this up and give it a try, I wanted to
    see if anyone could tell me if this was the correct
    way it should be wired. Don't want to fry the
    electrical system.
    Anyone have any thoughts?

    The old engine is a B&S 16HP model 311700 type 0132 E1
    code 990910ZE
    The repl. engine is a B&S 14.5HP model 287707 type
    0227 01 code 9412224B

    Thanks for any help.
  2. rockytopp

    rockytopp LawnSite Member
    Messages: 120

    You have a simple thing on hand.
    the two wires that come from under the fly wheel with the plug (red and black)
    is the alternator. it should plug to a matching set of wire's with the matching plug.
    the ones on the carb, I am assuming that your old engine did not have this style carb. the ground wire is good the other wire is the hot wire and must be tied into the ignition side of the switch, it controls a needle that works with the switch, to prevent backfireing at the carb when the engine is shut off, also it must work or the engine will not run.
    good luck.

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