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Old 09-10-2013, 04:14 PM
Worthing skier's Avatar
Worthing skier Worthing skier is offline
TT Enthusiast
Join Date: May 2010
Boat: mastercraft prostar 190 1993 & 1996
Location: West Sussex , sunny Worthing
Posts: 238

Hello all

A few electrical questions ,

The oil pressure gauge is always showing max pressure, but by disconnecting the sensor wire it drops back ,
Checked the resistance of the sensor 250 ohms at rest and decreases by applying compressed air to 5 ohms, so I would think the sensor is ok , got a good feed and earth at the gauge ,any ideas ?.

I do not have a trigger at the fuel pump relay (green /white wire)
does it switch pos or neg ?
I think this comes direct from the ECU , is the fuel pump relay feed as soon as the ign is on or is only when the ECU sees a crank signal ?

Also have a good feed to the injectors but when cranking the is no neg pulse .

Any help would be greatly received.


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