Daytime Running Lights and indicators

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- Pete Zahut
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posted 3 years ago

Sat, Jul 29, 2017 5:11 PM

Anybody got any experience of these:

formatting link

(link goes to Ebay)
They're apparently a straight swap for the indicator bulbs. In DRL mode
they show white, then in indicator mode the white goes out and they
flash amber > off > amber > off etc., until the manoeuver is completed
and then they return to solid white again.
The price makes me think it's got to be worth a punt and it seems a
great way to add DRLs to a car that hasn't got them.

- A
- alan_m
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posted 3 years ago

Sat, Jul 29, 2017 8:27 PM

Those 50Watt in line series resistors suggest a poor power supply design and maybe a substantial heatsink is required for mounting the resistors.

- G
- Gareth Magennis
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posted 3 years ago

Sat, Jul 29, 2017 11:11 PM

Those 50Watt in line series resistors suggest a poor power supply design and maybe a substantial heatsink is required for mounting the resistors.

- T
- Theo
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posted 3 years ago

Sat, Jul 29, 2017 11:39 PM

Indeed, though they're being run at 24-32W (6 ohms @ 12-14V) and the indicators are only flashing occasionally. So they're likely not getting too hot - unless perhaps you leave hazards flashing for long periods. They roughly match 21W indicator bulbs.
Though I can't work out where the power for daytime running comes from - do you have to run a separate wire from the ignition?
Theo

- R
- rp
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posted 3 years ago

Sun, Jul 30, 2017 5:05 AM

If you scroll down to the large photos the resistors are across the red/black input wires, from the bulb connections, and there is a separate white wire and fuse for the DRLs. The resistors are just to provide the required load for bulb sensing and have nothing to do with the indicator loading.
Any electronics to switch the DRL lights off when the indicators flash must be inside the led housing itself, and what are the chances of that, because the supply is intended to be constant when the ignition is on.

- P
- Peter Hill
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posted 3 years ago

Sun, Jul 30, 2017 12:48 PM

What it doesn't have is 3rd wire to the side lamps that either switches them off or dims them to side lamp intensity when side lamps are on. No law against any number auxiliary side lamps but an undirected unfocused 21W white light will be quite objectionable (like my 1W cree bike lamp) and render you liable to being charged with offence of "causing undue dazzle". Also DLR should only be on when the engine is running and not with key in "ACC" or "IGN". You need to get clever with some relays. Fuel pump only runs when engine runs (and primes) so that's a fairly easy to obtain engine run signal.
Relay 1. Coil feed from fuel pump. Power from battery via fuse. Output from N/O contact to relay 2. Relay 2, coil feed from side lamp, output from N/C contact to "DLR" on leds.
This should be in u.r.c.modifications.

Clearly won't work on lamps that have amber filters and not amber bulbs. That would usually be the cars that are old enough not to have DLR as standard.

- P
- Pete Zahut
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posted 3 years ago

Mon, Jul 31, 2017 9:50 AM

Peter Hill explained :

That's a great idea Peter, thanks.

Daytime Running Lights and indicators

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