75tonyA

iTrader: (6)

For the Led to indicate the oil pump has power.
I should probably put in some sort of resistor so the led doesn't get the full amperage. I'm using a 30 amp relay for the oil pump and a 20mV led.

What size resistor should I use?
Does the led need a fuse as well?

ddnspider

iTrader: (26)

A 30 amp relay doesnt mean anything for the LED. That's simply what the relay ITSELF is rated to, not how much current is in the circuit. And a 20mV LED is rediculously small, you sure you dont mean 20mA LED?The problem with what youre wanting to do is when you stick a resistor inline with the LED youre limiting the current in the circuit. So you would be limiting the current going to the pump.You could put an LED on the 12V input side of the relay.....but that will only tell you when youre giving power to the relay. A good relay shouldnt go bad for a long time so technically you could do it that way. In that case you should go with something like a 500 ohm resistor which gives you 24mA of current into the relay (12/500=.024). Then google a 12V LED that can handle 24mA's of current. Then just check the relay's input current rating. If it requires more current to trip then youll have to size the resistor appropriately as well as the LED specs.

taws6m6

iTrader: (37)

damn, I am dreading getting to this point in my build already, I don't know jack about relays and resistors

black98ws6ta

iTrader: (77)

It would be cool if you could get a really low pressure switch and put it on the return line back to the engine. That will tell you when the pump is moving fluid rather then just having power. The pump could have power and not be working.

ddnspider

iTrader: (26)

What about a hobbs switch T'd into the output on the pump? Anything over a certain PSI will short the wires together, could put an LED off that. So, assuming the pump is working, the hobbs switch should always be shorted thus always have the LED lit.

BadgeZ28

iTrader: (28)

just run a wire off the turn on side of the relay to the LED. The amount of current the pump draws has no effect on the LED. It will draw what it needs to light. If it is a 12-14 volt DC LED, you should be fine.

OUTLAWZ RACING

iTrader: (9)

I bought a led and switch combo from adavance for mine workes great. I blew a fuse and nothing powerd up just what I was looking for it cost bout 5 bucks.

cablebandit

iTrader: (37)

if the scavenge pump isnt working you WILL know. The car will smoke like its blown up with oil in the exhaust

ddnspider

iTrader: (26)

Thats not correct but whatever, not my car.

blacksi

iTrader: (3)

True story.