5 Pin 40 Amp Relay

All Customer Questions

Question

Can i use this relays to make a new harns for my capdown for wen i press the open swich the moters turn to one side and wen i press close the moters turn the other side.... i mean have the capabelity to turn + in - and - in + ...
can i archive this with 1 or 2 relays???
if i can how does the wireing has to be? - by Mike

Answer

Yes, I'm certain you can achieve this, but the wiring is beyond the scope of what I'd like to explain here. Perhaps you can seek help for the wiring on the Forums.

Question

I have amp fan that draws less than 1 amp of current to work on 12 VDC. Is a relay necessary or should i just hook it up to a switch. - by Luis

Answer

I'd just hook it up directly to a switch.

Question

which pin would generally be common contact, open contact, and close contact - by kory (vancouver, wa)

Answer

Sorry, I don't really understand the question.

When the coil (Pins 85 and 86) is energized, Pins 30 and 87 will be connected.
When the coil is not energized, Pins 30 and 87a will be connected.

Question

Do you offer 30 to 40 amp. relays with 6 volt coils

Answer

Sorry we do not, just what is on the website.

Question

how would i wire up aftermarket power windows ( left & right) to 2 toggle switches that are on-off-on? - by Paul (Miami Oklahoma)

Answer

Not Sure, Sorry!

Question

If I were wiring up a pair of retrofitted HID Projector Headlights, will this 40amp relay be enough to handle both or do you recommend the use of a different relay on your site?

Answer

I'd just use a relay for each side.

Question

in the photo showing the 5 pins, is:
30 top, 85 rt. 87 bottom, 86 left, 87a center? - by bill (miami fl)

Answer

Yes

Question

Does this relay come with a built-in diode? Or should I install a diode along with this relay? In doing some google searching it seems to indicate that a diode is necessary to prevent a voltage spike when the relay is turned off. - by Michael (Lakewood, CO)

Answer

There is no built-in diode. All relay coils initiate an inductive current spike when dropping out. This current will destroy any CMOS or integrated circuit. Diodes are needed to dissipate this energy only when relays are used in solid state circuits. Also, the diode must have the correct orientation. Check the Internet for applications. Hope this helps.

Question

The CMC brand aftermarket power tilt and trim PT-130 for OB motors uses 2 40 amp 5 pin relays to reverse the unit from up to down and down to up. These relays look identical to the ones supplied. Do you think that they would be direct replacemnts? - by Don (Tallahassee FL)

Answer

Sure, why don't you try it? If they don't work, we'll give you a refund.

Question

will these work for other relays in a car? such as turn signals or wipers?

Answer

Depends what type of relays are used for those things. With the proper wiring, relays can do tons of things.

Question

here is the question using a strip of 12 led for run,brake, turn sig... how would the relay get wired to do all of the functions.. also i would have to ust the drop volts off fo the relay to set up the strip right

Answer

You wouldn't need a relay for that, you could just use a combination of resistors to achieve the brightnesses you're looking for.

Question

What is the 87a pin used for? - by Jeremiah (Colorado)

Answer

The Pin 87a can be used for many things.

When the coil (Pins 85 and 86) is energized, Pins 30 and 87 will be connected.
When the coil is not energized, Pins 30 and 87a will be connected.

Question

Im hooking up 3 sets of cathode kits,all hooked up to one switch and its not bright.they are red,would a relay work to make it brighter and how would i hook it up - by chris (Round Rock, TX)

Answer

Red is a dim color. A relay wont help.

Question

a cathode kit hooked to the power and ground of the lights in the foot well will come on and go off when the door opens and closes. however if i use a relay is there anyway to use a switch to turn the cathodes on when the door is closed with out blowing a fuse or something - by Chance

Answer

Yes

Question

how would i wire this up for a negatively switched wire for my footwell lights that dim? and which pin do i use, 87 or 87a?

Answer

The relay has 5 pins:

85: Constant 12v (fused of course)
86: Negatively switched wire from your dome light
87: Output to positive of foot well light source (LEDs, cathodes, etc).
30: Constant 12v (fused of course)
87a: (leave disconnected)

And then you'll just ground the foot well light source (LEDs, cathodes, etc).

Question

can you hook up several cathode kits to one relay or are they strictly for one kit only?

Answer

You can hook up tons of things to a relay. A cathode kit only draws .7 amps, and this relay can safely handle 30 amps... 30 / .7 = about 42 cathode kits on one relay.

Question

What exactly is a relay? What is its purpose? - by Michael (Kansas)

Answer

A relay is an electrical switch that opens and closes under the control of another electrical circuit. For instance, if you wanted to use a wire from your vehicle's ignition, which usually does not carry much current and is not able to handle large amounts of current, to turn on a large power inverter you've installed.

Here's some good basics on relays:

HowStuffWorks
Wikipedia

Question

If using an LED light strip to replace my brake light, and turn signal, would this relay be used to make the LED light strip (1) light halfway in the idle position, (2) Make it light up all the way when the brake is engaged and (3) blink with the turn signals when they are engaged? - by Alberto (Pasadena, TX)

Answer

Yes, a combination of relays and resistors could be used to achieve that effect.