Hey everyone I could use some help in figuring this out. I have a 88 blazer 4.3 and the brake lights are constantly on wheni turn on my running lights also my reverse lights won't work the bulbs are good. My fuses are still good but is there a relay somewhere?

Thanks

 

you didnt cram an 1156 bulb in the tail lights did you? they need to be 1157 or equilvent (dual phase). Does the bright phase on the front blinkers come on as well?

 

I'm not sure what type of bulbs are there I'll have to check after i get off work... The blinkers for the front and back work just fine I'll post back with the bulb type

 

88 blazer uses an 1157 bulb.
I would start by checking all the grounds, they can do some funky things.

 

Ok.. Are there any relays and where are the ground points... Thanks for the replies guys

 

The bulbs are 1157