Headlight Relays

[ToddMcF2002]

Hi this is a pretty strait forward mod and the OEM wiring diagram is super clear. What I'm interested in is seeing is clean relay mounting options and how folks are extending the alternator output without creating a rats nest. Thanks!

 

[Jeff Erwin]

I mounted the relays under the battery pan which put them out of sight along with a lot of the wiring and fuses. I believe I pulled power from the starter relay which in my car (71 Charger) is located very close to the battery.

By the way, the whole installation is well worth the effort! Be aware, if you have hidden headlights you will likely need a new relay in that circuit, the factory relay leaks just enough current to trigger the relays and turn your lights on all the time.

 

[ToddMcF2002]

I mounted the relays under the battery pan which put them out of sight along with a lot of the wiring and fuses. I believe I pulled power from the starter relay which in my car (71 Charger) is located very close to the battery.

By the way, the whole installation is well worth the effort! Be aware, if you have hidden headlights you will likely need a new relay in that circuit, the factory relay leaks just enough current to trigger the relays and turn your lights on all the time.

Thanks Jeff yes luckily its a GTX so just the lights.

 

[toolmanmike]

You may find some info in Crackedback's thread. He makes the harness' and relay kits that are plug and play. top notch stuff. https://www.forbbodiesonly.com/moparforum/threads/plug-and-play-headlight-relay-kits.186716/

 

[Jeff Erwin]

You may find some info in Crackedback's thread. He makes the harness' and relay kits that are plug and play. top notch stuff. https://www.forbbodiesonly.com/moparforum/threads/plug-and-play-headlight-relay-kits.186716/

Yes, he very helpful. We talked quite a bit about the need for the new relay. Hopefully he adds something to his docs about the need.

 

[Darter6]

Head light relays right of the master cylinder on inner fender.

 

[Jeff Erwin]

View attachment 1192051
Head light relays right of the master cylinder on inner fender.

Wow, you have SO much room in there! I have to cram stuff where it will fit and not make a mess.

 

[72RoadrunnerGTX]

 

[wahya]

You may find some info in Crackedback's thread. He makes the harness' and relay kits that are plug and play. top notch stuff. https://www.forbbodiesonly.com/moparforum/threads/plug-and-play-headlight-relay-kits.186716/

I bought those relays and they are in front of the battery like 72rrgtx pic. The lead is long enough to go back to firewall and then connects to alternator. (Per instruction)

 

[Billccm]

I mounted the relays to a thin aluminum sheet and installed under the battery tray. @Crackedback kit works great.
I've got videos of the job I need to edit and upload.

 

[493 Mike]

I purchased a small, sealed box on line and put the relays inside. It is installed left of the battery.
Mike

 

[Crackedback]

Depends on how you want to go about it.

If you want to drop a secondary busspoint, then run a decent gauge wire to that location from your alternator.

When I do the relays, I run two power circuits (all wires wrapped in shrink for easy hiding within the OEM tabs/harness) and mount relays under the battery tray area on most B/E cars. Keeps things hidden and stealthy.

Don't pull power at the battery for anything with an OEM charge path set up.

 

[Crackedback]

View attachment 1192051
Head light relays right of the master cylinder on inner fender.

That is VERY nice...

 

[383man]

I mounted mine near the rad core support in the left front. Since my battery in my 63 is in the trunk I have a hot post on my firewall that the battery cable from my trunk mounted battery goes to and I take my hot feeds to the relays that feeds the headlites right of that hot post on y firewall. Course the hot feeds are fused and it really made my headlites brighter. When I checked the volts at my headlites before I put them on relays I had about 13.1 volts at the headlites but everywhere else I had my normal 14.5 volts as the eng was running. I was figuring in some voltage drop since the power goes through the firewall connector and through the contacts on my 50 year old headlite switch but I was not exspecting that much voltage drop. Made a nice difference having 14.5 volts at the headlites now since the switch just turns on the relay windings. Good luck with yours as its a great thing to do on our 50 some year old muscle car. I should have done it years ago. Ron

 

[F4R/T]

I really like the idea of taking the load off the headlamp switch.. It has to help! Cracked back do you also sell a relay to replace the factory hidden headlamp door relay with your kits? I’m considering one for my 70 & 72 charger.

 

[72sunroof]

Or you can use LEDs and not worry about the load.

 

[ToddMcF2002]

Or you can use LEDs and not worry about the load.

I did that for one of my Mustangs but only because it looks like a stock housing as you can see. Is there an equivalent for b-bodies?

 

[Robbins]

I realize this isn't an old muscle car, but this is my 86 RC....the low is for the low beams and the high is for the high beams.

For what ever reason I don't have one picture of them on the 64 Valiant...no battery box on it.....so they're in that area now.

 

[JG71B]

Hey Ron, yer inbox is full. Wanna pic yer brain on yer alternator and amp output at idle....

 

[t_bone]

I purchased a small, sealed box on line and put the relays inside. It is installed left of the battery.
Mike
View attachment 1192123

Hi Mike - nice installation. I've been looking for a small box like that to cover the terminal connections on an under-dash 4PDT switch to make hazard lights for my '64 Sport Fury; where online did you find the box that covers your relays?