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Briggs Stratton 16HP Twin - Electric Question

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Aussie Bruce

05-01-2004 01:12:33

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G'Day,
I have a Bolens G16YT with a Briggs Stratton 16HP Twin (Model 402707 Type 013801 Code 82022312)I picked up from a old blokes barn.
The electrical cables had been pulled out of key switch and I am sorting basic wiring to see if engine runs.
I have one wire that connects to coil and another than runs into engine does anyone know if I need to hook a wire up to the positive terminal to get a spark happening at plugs or to make run circuit?
Ive got the starter motor turning the engine but no spark at plugs.
Thanks,
Bruce

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Kent of SW MO

05-01-2004 10:40:47

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Re: Briggs Stratton 16HP Twin - Electric Question in reply to Aussie Bruce, 05-01-2004 01:12:33

DO NOT connect 12 volts to the coil. The ingnition is a magneto some witha solid-state trigger. 12 volt will burn it up. You ground the wire from the coil to stop the engine. If you do not have fire the coil, point or condenser is bad if it has point. If solid-state it is time for a new coil. Someone before you may have hooked the coil to 12 volts.

Kent

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Kent of SW MO

05-03-2004 06:58:38

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Re: Re: Briggs Stratton 16HP Twin - Electric Ques in reply to Kent of SW MO, 05-01-2004 10:40:47

I forgot if you do not have points or a condenser, only very early 18 twins have them, you have a Magnetron ingition. The electronics is built into the coil.
Kent

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Aussie Bruce

05-03-2004 05:28:56

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Re: Re: Briggs Stratton 16HP Twin - Electric Ques in reply to Kent of SW MO, 05-01-2004 10:40:47

Thanks Kent for info ... greatly appreciated ! Cant see a condensor just the coil. Where would I find the condensor? - I will replace the coil as suggested.

There is one other wire that appears to run into the centre of the engine which has two wires joined half way along. Both have a diode attached but in opposite directions. One wire is connected to positive on the device (large terminal near battery - chasis mounted - I dont know what its called?) that the battery positive cable connects to, the diode ALLOWS power along the cable and into the engine. The other wire is not connected to anything and appears NOT to allow power down into the engine wire BUT allows flow from the engine wire back out.

Do you know what this should connect to? Is it to charge the battery when engine is running?

Thanks & Regards,
Bruce

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Kent of SW MO

05-03-2004 06:55:23

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Re: Re: Re: Briggs Stratton 16HP Twin - Electric in reply to Aussie Bruce, 05-03-2004 05:28:56

You have what B&S call a dual circuit alternator. The side with the dual diodes supplies dc power. One diode charges the battery on the positive cycle. The other diode supplies neg. 12 volts, with respect to the frame, normally to power an electric Power Take-off Clutch. The other half of the alternator normally supplies power for the lights. There is also normally a larger power resistor in the circuit. The alterntor stator is under the flywheel wirh perm. magnenets on the flywheel. Where are you at Down under? I have a friend in Bundadune( spelling?)

Kent

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Aussie Bruce

05-03-2004 07:50:29

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Re: Re: Re: Re: Briggs Stratton 16HP Twin - Elect in reply to Kent of SW MO, 05-03-2004 06:55:23

G'Day Kent, I live in Sydney a fair way from your mate.

Appreciate the info. If I dont connect the diode wires to anything (at present) and fit a new coil should the engine start by being turned over by the starter motor and no other electrical connections?

From your original reply I figure I ground the coil wire to stop the engine.

The mower doesn't appear to have a power take off clutch (foot pedal,pulley/spring and belt only) but does have a attachment switch connected on one side to a pulley that engages the cutting deck.(the pulley mechanism for the deck engage also has 1 wire connected to ground, so I actually presumed that +12v connects to the other side of the swicth) Do you think the -12v connects to the other side of the switch or am I right with the +12v?

Thanks & Regards,

Bruce

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LAN

07-27-2005 01:48:04

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Re: Re: Re: Re: Re: Briggs Stratton 16HP Twin - E in reply to Aussie Bruce, 05-03-2004 07:50:29

Submitted 27 July 2005.

Hi Aussie Bruce,

This is a bit strange, I'm up in Queensland, I've got a Bolens G16YT mower and it has the 16HP B&S motor on it. Model 402707 Type 013801 Code 82022312..... I thought the Code number was supposed to be unique (engine 12 built on 23 Feb 1982????), Anyway was wondering about the similar issues you have, but more specifically how to make sure the alternator is charging. I have a black wire coming out of the front of the motor under the air cleaner and I don't know what it is to hook up to. From the stuff I've downloaded from B&S website, I'm assuming it is the alternator wire, but I can't find a service manual anywhere and operator manuals are pretty basic. I thought you may have been able to find a wiring diagram, any ideas where I can get hold of one?

Would appreciate any help.

Cheers
LAN

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Kent of SW MO

05-04-2004 07:04:07

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Re: Re: Re: Re: Re: Briggs Stratton 16HP Twin - E in reply to Aussie Bruce, 05-03-2004 07:50:29

The bottom shaft on a vertical shaft engine is considered the PTO (power take-off) shaft. So you do have a PTO Eletric clutch and yes on some engines a negative 12 volts is used for this clutch. the givaway is the twin diodes. If the bands are still visable on the diodes you will see one band is toward the engine, one is away from the engine. You get a positive 12 volts from one to charge the battery. This line should have a fuse in it to protect the alternator stator in the advent someone installs the battery backwards. The other diode is the source of the negative 12 for the PTO clutch.

Kent

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