OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines murray 42900A with a briggs and stratton 14hp carb

im trying to find out where the red and black wire go. the carb has a solenoid which i beleive the red connects, but cant find where the black goes.

Hi hockeymark, welcome to Outdoorking.

Murray has all of its Illustrated Parts Lists posted on the internet, here:
http://partsandservice.com/html/Murray/lt/

Here is the one for the 42900A:
http://partsandservice.com/html/Murray/lt/lt42900a.html

I do not see any carburetor solenoid, or wiring for one. Note there are several red and several black wires, BTW.

Is this the correct wiring diagram for your ride-on? Is your engine a Briggs 287707, as shown in the parts list?

there is some confusion, it is a 287707 and the 022501 and 9401134B. i looked at the diagram and it doesnt show the carburator selanoid. thats why im stumped. im pretty sure the red goes to the carb but the black im not sure

I agree that the Briggs 287707 has an anti-afterfire solenoid screwed into the bottom of the carburetor float bowl. The solenoid should have two terminals on it. You should ground one of these with the black wire, and connect the other to +12V only when the engine is switched on (red wire) - note the anti-afterfire solenoid is Item 7:


There are two different solenoids, depending on whether you have a Walbro or Nikki carburetor, but the wiring appears to be the same in either case.

At this point I do not understand why the Murray wiring diagram does not show these wires.

Here is the Illustrated Parts List for your engine:
http://bsintek.basco.com/BriggsDocumentDisplay/Z6hrsJVJ1DajI.pdf

The above wiring diagram comes from Briggs P/N 270962, Single Cylinder L Head tech manual.

Hi Grumpy, I worked on a husqvarna last year and it had a solenoid on the carby ,when I rewired it the earth was green and the red which was black in the photo this wire was live but only when you turned the key on to start. Sorry about the poor quality photo ,ihad to take a picture straight from my cameras screen.
The positive wire ran back over the cylinder head and hooked up on the other side.

Thanks roebuck. Were the two wires that went to the solenoid in a one-piece plastic connector, or were they separate wires? They need to be attached to the solenoid the right way around, or the 12 V from the battery will try to shut the fuel supply off even more firmly, rather than pull the solenoid open against the resistance of the spring.

I took a picture, there is only one place that i can see where the wire will connect, the wires are connected together where they go to the ignition where they seperate, the wires that go to the ignition are blue and yellow

If there is only one terminal on the solenoid it has to be a +12V that is only active when the engine is switched on. If you have a voltmeter or test light you can easily check that. Red is the most common colour for +12V wires, but there isn't really a standard colour system.

Grumpy I'm sure they where two seperate wires into the one red connector ,sorry took so long have been flatout.

Thanks for that roebuck, it looks as if both wire terminals on the solenoid are used on the Husqvarna. One is a +12V that is only active when the engine is turned on, while the other is just a ground connection. The only question I have is how the connector is designed. It has to be plugged into the solenoid the right way around, because it has to energise the solenoid to pull in, not to push out. That would normally call for a 2 wire plastic plug that is assymetrical or has a fin on it so it can only be plugged in one way.

hockeymark's Murray has done it the easy way, and only has one (red, +12V) wire connected to the solenoid, as shown in his picture. It must get its ground connection through the studs the carburetor mounts on.

Grumpy I got it wrong, here is a drawing .I can't see the green in my photo because it splits off behind the carby and the positive continues on to the red capsule which I think might be a fuse or a something to prevent a spark ,a red wire then goes to the solenoid. Sorry for the confusion .

Thanks roebuck, I think that explanation might be helpful to hockeymark - it sounds quite similar to his machine.