k series oil pressure light

[menostig]

Hi
Im my caterham supersport I have a capillary oil-pressure gauge, which always works and shows healthy pressure. But can I get my low oil-pressure warning light to work? No, I can't. It is wired to a sendor in a T piece off the sump, shared with the gauge. It used to work. Then it stopped. The garage replaced the sendor with one form Caterham, but this bizarly used to shine brigher with increasing oil pressure (say in the few seconds after cold starting). It had one spade terminal on connected to the light. Someone pointed out the garage had probably stuck an oil pressure sendor in rather than an oil pressure switch. So I ordered a 20psi switch from Think Automotive. Now the light never burns. It has 2 terminals, one connected to the light, the other to earth, or alternatively not connected - makes no odds - the light never comes on (say with ignition before starting).

Any ideas?

cheers
Roger

[Dave J]

have you tested that the bulb hasnt blown ?

have you checked the earth on the sender ?, somethimes plumbers tape prevents a good earth on these.

dave

[reg_slr]

menostig said:

So I ordered a 20psi switch from Think Automotive. Now the light never burns. It has 2 terminals, one connected to the light, the other to earth, or alternatively not connected - makes no odds - the light never comes on (say with ignition before starting).

Any ideas?

Start at the bulb. Attach one side to earth and then one to 12V. If it doesn't light replace the bulb. If the bulb lights then you need to check the switch is opening and closing. Use a cheap test meter accross it when the engine is off, it should be in one state then after starting and reaching normal pressure swap to the other state.

If it were me I would run an earth into and out of the switch then attach 12V to the other side locally in the dash.