I tried to wire a relay to my fan switch today and it wasnt working. The Fan switch that i bought is a 12v switch. The relay has 5 prongs postive, negative, 2 lamp prongs, and a fuse prongy question is does the fuse prong go to the fuse box under the dash for accessories? Because I'm wiring it to the fuse box under the hood where the is a blank spot. Or should i just wire it with a inline fuse? and what size fuse would i use?

 

bump neeed some help

 

do what i did and hook it to toggle switch.when ever your cars warms up to temp. hit the fan on.

 

or u could just wire it to hot wire and have it run at all times when key is on

 

i used a 20a fuse but it keeps blowing should i do inline fuse?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shooitslinh &raquo;</TD></TR><TR><TD CLASS="quote">i used a 20a fuse but it keeps blowing should i do inline fuse?</TD></TR></TABLE>

You obviously have something mucked up here.

The relay energizes when you send current through it's coil (most likely the positive and negative prongs you refer to) The fan switch should be energizing the coil. It's not a bad idea to have that part of the circuit fuse protected, unless you are already tapping the power source from a fused circuit. The fuse rating should be a little larger than the current draw rating for the coil.

The contacts, which could be normally open or normally closed in operation, are what switch whatever you are feeding through them. The current through these contacts are limited by the device's rating. You want that circuit to be protected by a fuse large enough to handle whatever you are powering but still within the limits of the contact ratings.

As for the additional "fuse prongy" you refer to, I have no idea. The package the relay came in should have a diagram that shows what prongs are what.

 

Well I tried to make a switch instead and the fuse kept blowing out

 

how many amp is the switch rated for?and what gauge wire you run foir it ?

 

its a 12volt switch and the gauge is 12 i think

 

ok the prongs are fuse to battery,negative, two lamps, and switch. I wired it as from battery to a 30a fuse to the fuse to battery. Then the negative grounded to the frame. The two lamps i wired to my fan. And the switch i wired it to the switch and grounded the switch but nothing happens.