Switchback bulbs blowing fuse

I'm trying to install DRL/Turn signal switchbacks on 2013 Tacoma TRD Sport,every time bulb is installed fuses blow ...replace fuse and install regular 4157 bulb everything is good,any help appreciated
Thank You......
Also have heard that sometimes they will blink rapidly because of LED .?...

 

You installed a resistor? You can't simply replace regular bulb with LED.

 

Pick one thread and stick to it.

http://www.tacomaworld.com/forum/2nd-gen-tacomas/354956-switchback-bulbs-blowing-fuse.html


And Yes you can install Leds without any resistors. You'll just get hyperflashing. OP's issues it Tacoma uses CK bases where these only Support Standard bases.

http://www.ebay.com/itm/3757-3157-S...ight-Dual-Amber-White-Bulb-Lamp-/111245985505

 

Where would resistor be installed??

 

I am going through the same thing.
I bought some 3157 led's amber/white switchback.
they immediately blew fuses in the blinker circuit and the parking light circuit, with or without resistors and trying both ways, switching polarity.
I eventually got the blinkers working with the resistors and by increasing the fuse value.
but the parking light circuit blows a fuse hard, all the way up to a 30A fuse.
no resistor on the parking light circuit LED's.
I took everything back out and re-installed the original 3157 bulbs.
I already have LED blinkers in the rear, with resistors - no problems.

1. it shouldn't be this hard.
2. what's with that crazy blinker?
3. I thought LED's drew way less current than a bulb. How can I possibly be blowing fuses with an LED? I realize the resistor adds resistance but I blew fuses even without the resistor. I don't understand.

 

You need LED bulbs that have the CK base, or you will blow the fuse. Hyperflashing is a different issue, and you need the load resistors to resolve that.

 

CK base - thanks for that
it seems that the ck base just about doubles the price
story of my life
haha

 

Supply and demand, my friend.

Most folks do not need the CK wiring design...so most bulbs do not conform to that standard. Fewer bulbs produced equals higher price.

The hyper flash/resistor problem is indeed another kettle of fish.