I have used a relay and the orange wire from the under hood fuse box to turn the pump on i was trying to use a led (blue) wired up between the fuse and the water pump so i will know if the pump is on when the led is on. if the led is a 5 volt do i need to use any resistors or diode if so what size? i have a diagrahm from akm cables but it does not say anything about resistors.can anyone help thanks!

 

I belive I used a 470k diode.

 

I bought 2 LEDs with resistors built into them from radio shack for like 2 bucks. One (green) is hooked to the ground line, and the other (red) is hooked to power. If either light fails to light then I know I have a problem, and I can get a idea of which line to chase by the color of the light.

Q

 

I bought a blue led from radio shack (5 volt/30ma/300mcd) i hooked it up and it came on but now it will not come on even if i hook it directly to the battery i think maybe it has blown. 5mm (part# 276-311) is what i used. thanks

 

Dreamer1q do you know the part numbers?

 

If it's 5 volts, it probably blew.

 

No clue on the part number. Just find one with a built in resistor. You should be fine

 

I got my LED from radio shack. I believe it was inernally resisted. It has been working fine.

 

While on this topic where can I get a relay for the pump and how much do they run?

Thanks

Dan

 

I seen one at radio shack( was $7.99)for that relay, I used the relay from the air pump that I removed from the car.