Oil pressure bypass switch

As most of you are aware my machine is a spitfire 3.2 with a 16hp Briggs and Stratton engine
There is an oil pressure bypass switch mounted to the throttle cable box
Howether mine is damaged and needs replacing or repairing
I have a CD work shop manual with all brigs and Stratton engines in and I can’t find anything about the oil pressure switch
In the spitfire manual in the wiring diagram there is no mention of an oil preure by pass switch and under the engine section of the manual I cant find anything ever
I’ve been into a brigg and stratton dealer today and they cant find anything ever
So this is a bit of a mystery and I don’t even know wear you are supposed to wire the switch to
On the switch on the black box it say 0026 Mexico o; goggled it and still nothing
I think it’s supposed to switch the engine off when the oil pressure is low but I don’t even know wear is supposed to be wired to
Anyone have any more info on this please

Thanks

Batista230

I think you could be right there
I don’t have the machine with me but I do rember a male spade wire conector near the oil filter this is probably the sensor
On the by pass switch there is only one wire coming out from it so I presume it earths through the body of the engine
For it to work it would have to wired to the engine stop lug
On all other applications on the machine its engine stop lug to switch to earth
So it would need to be engine stop lug-sensor-by pass switch to earth through the engine body if
My guess is right
Hear a quick diagram of how it could work; please let me know if I have got it wrong



If this is right then all I need now is a new switch
Anyone know wear you can find them

Have looked at my Briggs and stration manual again and it says that the oil switch is optional and supplied by the equipment manufactures including wiring
I rely don’t know why hydramaster have not included this in the manual

Whats supposed to happen when I press the switch

No I have defiantly not messed up the wiring when I was playing with the relays
I say when I started this project the only wiring that worked on the machine or was ever there was the battery terminals live and earth
As for playing with relays; after several attempts with the ‘pump in pump’ relay and float switches I found a sparky on another internet forum who drew me a schematic wear by I use 2 relay one as a latching relay for the floats and the other to control the pump so there is no load going from the pump to the switches
This now work fine and now I have come to the conclusion that ever the original wiring schematic was crap or the hydramaster/harwill float switches wear designed for a switching current of 15amps
I emailed hydramaster in Seattle and asked the question if there float switches would hold a load of 5amps enough for the pump as the ones I was using are rated at ½ amp
They never replied
I also asked harwill float switch if they could supply me with a float switch rated at 5 amps with approx dimensions that I needed as the floats they had listed on there site when you could load it up wear rated at 15 amps
Again they never replied
So I wonder why they never replied ‘ow yes batista230 our switches are what you need our switches will hold the 5 amp load you require we can supply/sell you them’ why have hydramaster gone quiet I can only come to one conclusion that the schematic is crap
And that the diode is place is a codge but this is only my opinion as there seems to be great debate on the purpose of a diode some say it for reducing the flow of current and others say its to allow the flow of current in one direction and to stop any back firing in the other direction
Wikapida quote seen hear http://en.wikipedia.org/wiki/Diode a diode is to allow an electric current to pass in one direction (called the forward biased condition) and to block the current in the opposite direction
And I would rather take wikapidas defanition then enyone ells and presides the suppliers of the switches ‘switch and sence’ said after my first attemt of wiring the float switches up has not worked and after they saw the spitfire schematic they said it was due to the way the lower switch is wired into a relay and nothing to do with the fact that there is a diode there or not

And for the low water engine stop float switch this workes fine following the spitfire wiring scematic into relay est.
As for the waste tank float switch as I said befroe following the wiring scematic its an easy setup stop lug-switch earth-earth
The original switch I had on was a bit iffy befor I used it when I fitted it and tested it to the machine following the scematic it blew shows N/O all the time
Howether I’ve sorced for little money a heavy duty ball bering float switch that holds a load up to 10 amps wired it up first time following the spitfire scematic and it works fine all though it is a bit big 4”x2”’x1” but for the waste tank its all right

So all in all I’ve had very little advice on the wiring asked electrition who could not solve or under stand the scematic of the pump switches and gone away and done it by myself
and it now works
and as for being over my head as I rember you wear the one saying ditch the water box as it an elcrical headake and go for a macanical one and I did ask the question in the prochem thread of this forum but to no reply

Now I have looked at your quote again and I think the reason I did not respond to your question about weather there was an override switch or not because I did not understand what you meat
And I still don’t understand ever or are you saying the oil pressure switch is an override switch coz if it is it ant in the spitfire wiring schematic

We in the Europe don’t have the faculties that you lot in the states have over there
Trying to find some one who knows anything about a machine that no one has ever heard of you are pissing in the wind

Hear is the full wiring schematic from the spitfire manual
My wiring has an extra relay on for the pump in pump mixer tank
Same set up for the low water float switch and same for the waste tank float switch as you can see the waste tank FS is not wired into any relay and my switch will hold 10 amps

As you can see in the other photos the throttle box
This is wear the oil pressure bypass switch is
This is broken and there is only one wire coming out from it and i’m not sure if there should be 2

Nope that the full schematic 3 page long its juts that I’ve posted them in the wrong order
The second one down is actually the first page and the top one is the second page
They bough join together like an A3 piece of paper follow the wiring loop at the top and bottom of bough page and you will see them join up
Basically it a 3D drawing of the machine
The last page is just a summary of bough pages simplified

When you say momentary contact or a breaker I think you mean a switch
I will research it into googeled now
But if the machine you have used never had one what was your oil sensor on top of the oil filter wired up to and did it have one out let wire terminal or 2

Thanks

Batita230

Did you mean these
http://shop.ebay.co.uk/items/__mome...5ftrksidQ5Am38Q512el1313QQ_trksidZm38Q2el1313

Let me get this straight the senor is mounted on top of the oil filter and it earths its self through the body of engine
On wire comes out of it and dose this go to the momentary contact and if so wear dose the other wire from the momentary contact go to

I have a funny felling that when you press the momentary contact the engine should shut down so if all what I have said is true would the other wire from the momentary contact be wired to the engine top lug

do you mean the water tight juntion box or the fuel pump juntion box