4 high AND headlight relay mod!
 

Hi all, truck is a 93 c1500 with composite headlights. I've seen the guy on here selling his heavy duty harness with the 4 high mod that included a total of 3 relays. Doesn't look like he's available anymore so I was wanting to do it myself. I've done the Headlight relay upgrade on my 70 c10 and was pretty straight forward. I want to do it on my 93 but I'm not sure WHERE to add the 3rd relay for the 4 high mod. Do I add it after the relays on the light side or the truck side of the relays from the headlight relay upgrade? Super confused about this..

Re: 4 high AND headlight relay mod!
 

The Baron cat you're referring to has indeed appeared to vacate all things wiring related but if you need a 4-HI HD relay kit, I build plug n play harness kits. My kits only require the use of 2 relays instead of three and they have 4-HI built in. Relays are 40A sealed Hella and wiring is j1128 spec too. If you want/need more info PM me for details.

Re: 4 high AND headlight relay mod!
 

First pic shows one of my 86-older style headlight plugin play relay kits, the second one is one of my 88-98 headlight plug n play kits-for reference. I have a lot of options on harnesses from 1960's and up...some people want a full lighting harness, others want a delay off headlight option, etc.