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John Morrison Avatar
John Morrison John B. Morrison
Collierville, TN, USA   USA
Just received the DRL Relay and harness kit from Victoria British. Going to experiment with it and the LED H4 bulbs I picked up a few weeks ago. The connections look straight forward enough, but I also have “Limey’s” (Bits for Brits) headlight relay installed. SHould I hook the DRL relay directly to the low beams per the VB instructions or with the headlight relay already installed go through that somehow?

Thanks in advance!

John Morrison



'71 B-GT; “Petey The Petulant”
'05 Honda S-2000 “Saburo”
Factory 5 Racing MkIII Roadster (Cobra Replica) project

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vagt6 Avatar
vagt6 Mark K. Brown
Charlottesville, VA, USA   USA
I always drive with headlamps on in my LBCs, just like a motorcycle. Using DRLs doesn't include your rear lamps and side markers, which increase visibility, too (a little).

Steve Stephenson Silver Member Malcolm Stephenson
Surrey, BC, Canada   CAN
1973 MG MGB
I replaced all bulbs, except for headlights, with LEDs. Then picked up a couple of el cheapo LED bar spots and put them behind the grill, wired them into the side-lamp circuit. Drive on side lamps plus. Total current drain about 2 amps if memory correct.
I am told it looks pretty good oncoming, also several comments re Xmas trees as the LEDS are pretty bright !! Trucks keep a little further back than they used to as well!
Cheers
steve

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JoeReed Avatar
JoeReed Gold Member Joe Reed
Cordova, TN, USA   USA
1978 MG MGB "Kermit"
Could you post a copy of the schematic for the DRL kit?

I'm pretty much an idiot when it comes to electrics (among many other things) but I wonder if you could just use the existing relay. Your existing relay is switched on when the headlamp switch is on...and sends power to the lamp from a more direct source. I'm just guessing that the DRL kit powers the relay from one of the green circuits - so it switches the power to the low beams on whenever the ignition is on. The part I'm not clear on is how the DRL circuit functions (or, more accurately, doesn't function) when the headlamps or own (either low or high beam).

Maybe a schematic will explain that...




MG Cruiser Avatar
MG Cruiser Gold Member Keith Delta4
Rockingham, WA, Australia   AUS
1970 MG MGB "Moneypit"
Do you have a local code as to the use of DRL’s?
Here in Western Australia they have to dim when the side lights are put on and that is what the relays are used for here.
Keith

John Morrison Avatar
John Morrison John B. Morrison
Collierville, TN, USA   USA
Hey Joe!

Unfortunately, no schematics handy, just a “stick figure” even a fellow idiot can follow, if I didn’t already have the relay to power the headlights....

Sorry I haven’t made any Memphis BSCC meetings lately, seems I’m flying trips to some different time zones for them.

Cheers,

John

In reply to # 3658031 by JoeReed Could you post a copy of the schematic for the DRL kit?

I'm pretty much an idiot when it comes to electrics (among many other things) but I wonder if you could just use the existing relay. Your existing relay is switched on when the headlamp switch is on...and sends power to the lamp from a more direct source. I'm just guessing that the DRL kit powers the relay from one of the green circuits - so it switches the power to the low beams on whenever the ignition is on. The part I'm not clear on is how the DRL circuit functions (or, more accurately, doesn't function) when the headlamps or own (either low or high beam).

Maybe a schematic will explain that...

John Morrison Avatar
John Morrison John B. Morrison
Collierville, TN, USA   USA
Not an issue in the U.S, much less Tennessee!

Cheers,

John

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JoeReed Avatar
JoeReed Gold Member Joe Reed
Cordova, TN, USA   USA
1978 MG MGB "Kermit"
I'm thinking that the DRLs should be on whenever the ignition is on EXCEPT when the headlamps (or at least the high beams) are on. Since they ARE low beams, having two source of power going to the low beams shouldn't matter...the bulb isn't going to draw twice as much current just because the wiring could potentially provide it. I'm assuming it would be a bad thing to have both the high and low beams on at the same time....too much current draw?.....too much heat in the bulb?

Beyond those thoughts, I haven't come up with an answer. Still thinking.... smiling smiley




78mgb White Wonder 78mgb
apple valley, MN, USA   USA
1978 MG MGB
In reply to # 3657858 by vagt6 I always drive with headlamps on in my LBCs, just like a motorcycle. Using DRLs doesn't include your rear lamps and side markers, which increase visibility, too (a little).

Me too.

I use my brights all of the time. The newer cars have really bright driving lights. So I figure that my brights (halogens) are about the same.

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John Morrison Avatar
John Morrison John B. Morrison
Collierville, TN, USA   USA
Standard DRL’s power the High-Beams at 40%, but the VB kit just powers the low beams at full power (they do sell a separate “power reduction module”, but I’m keeping this as simple as I can). I have a set of H4 LED replacement bulbs I’m plnning to instal as well, so much lower amperage if this works.

John

In reply to # 3658159 by JoeReed I'm thinking that the DRLs should be on whenever the ignition is on EXCEPT when the headlamps (or at least the high beams) are on. Since they ARE low beams, having two source of power going to the low beams shouldn't matter...the bulb isn't going to draw twice as much current just because the wiring could potentially provide it. I'm assuming it would be a bad thing to have both the high and low beams on at the same time....too much current draw?.....too much heat in the bulb?

Beyond those thoughts, I haven't come up with an answer. Still thinking.... smiling smiley

JoeReed Avatar
JoeReed Gold Member Joe Reed
Cordova, TN, USA   USA
1978 MG MGB "Kermit"
Here's another thought...

Since you already have relays installed, your low beam relays should now be triggered by a blue/red wire on pin #86 (or 87). If you instead fed that pin from the green circuit (3rd fuse from the top), that would automatically switch on the low beams whenever the ignition is on - so they would serve the DRL function. I'm guess you don't want to bother with resistors to partially dim the lights in DRL mode since you're planning to going to LEDs.

Still working how to turn those OFF when the high beams are on confused smileyn







Edited 1 time(s). Last edit at 2018-01-07 09:25 PM by JoeReed.

John Morrison Avatar
John Morrison John B. Morrison
Collierville, TN, USA   USA
Joe,

You, Sir, are hired to be my Automotive Electrician Specialist!

Safety Fast!

Joh

JoeReed Avatar
JoeReed Gold Member Joe Reed
Cordova, TN, USA   USA
1978 MG MGB "Kermit"
Still gotta figure out how to kill the low beams when the high beams are switched on. I'm sure there's a way...probably using another relay...maybe a normally closed one.

Don't call me if you burn your car to the ground devil smiley




JoeReed Avatar
JoeReed Gold Member Joe Reed
Cordova, TN, USA   USA
1978 MG MGB "Kermit"
What if.....

...you changed out the low beam relays for normally closed relays...and moved the power supply on pin 30 to the green circuit...making the low beams come on whenever the ignition is on. Then....

...power pin 86 on that relay from pin 87 on the high beam relay (assuming 86 comes from the switch and 87 goes to the lamps).

I *think* this would light the low beams whenever the car is running UNLESS the high beams were switched on. That would trigger the normally CLOSED relay on the low beams to open the circuit.

I'm sure I'm probably missing something important....




late 64 Terry O
Milton, Ont, Canada   CAN
easy way as you suggest. normal closed contacts on another relay that is turned "on" when you have your high beams on this would break the circuit to the low beams on the DRL side when in use..........thumbs up

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