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df2x4

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Any links where I can get a 4 HI harness? Tried searching on this forum and "no results" or nothing that applied

LMC Truck and Painless Performance both have options. I haven't used either personally but I've seen other people here recommend them, one earlier in this same thread.

http://www.lmctruck.com/icatalog/cd/full.aspx?Page=64

https://www.painlessperformance.com/wc/lv.php?sl=30817

EDIT - Whoops... Sorry I mis-read your post. LMC has a 4-Hi relay kit in addition to their HD harness offering. @98chevy2500SS said he's using both of them together successfully at the top of page two of this thread. Here's the link to the LMC 4-Hi kit.

http://www.lmctruck.com/icatalog/cd/full.aspx?Page=103
 

OutlawDrifter

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For those buying the LMC harness. Skip the 4-hi setup and wire a diode between the low beam and hi beam trigger wires. Put it in so it sends juice to the low beam side when the hi's are on...done deal.

I've done this many times, works like a charm...costs less than .25 cents.
 

Eskimomann209

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Crazy I seriously almost gave this guy money for two harnesses for my 73 on another site...
guess will wire it myself now
 

eshaw

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For those buying the LMC harness. Skip the 4-hi setup and wire a diode between the low beam and hi beam trigger wires. Put it in so it sends juice to the low beam side when the hi's are on...done deal.

I've done this many times, works like a charm...costs less than .25 cents.
Maybe you can do a "How To" to show everyone how easily it's done?
 

drag sgt

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Here you go https://www.painlessperformance.com/wc/lv.php?sl=30817 probably the best you can get and from a reliable source too.

I put a LMC on a '96 C1500 and didn't have any issue with length. What I didn't like about it is the bulb connectors are cheap plastic and the relays aren't the traditional Bosch style. I went ahead and changed the relays since the wire pins are a direct fit to Bosch style.

Do you happen to have a part # for the Bosch relays?

I bought a 10ft role of split tubing to go around the LMC harness and a couple headlight bulb connectors to replace the ones with broken wings. After a bunch of clean-up it looks much better and I'm less worried about wire chaffing. now I just need to find a nice spot to mount the relays.
 

delta_p

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If you want the standard kind where pin 87a is normally on and relay operation switches off 87a and switches on pin 87, a 30amp version is Bosch 332209150. This a type A relay i believe.


If you want the type that no output is normally on (two pin 87's) and pins' 87 are switched on with relay operation, this version is Bosch 0332019150.


I would try to double up the headlight supply wiring onto pin 87 if possible when using the type A.


 

delta_p

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for the headlight harness with diode, you can wire a diode at the relay triggers pins. When the low beam relay is triggered the diode blocks. When the high beam relay is triggered the diode allows the low beam relay to trigger along with the hi beam. Thus the 4 hi.

Should look similar to this.

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