 LED headlight conversion needed load?, What do I need to make my fog lights work properly |
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| Wyvern |
 Feb 16 2021, 07:32 PM
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#1
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Member  Group: Members Posts: 324 Joined: 7-October 15 From: San Francisco (East Bay) Member No.: 19,245 Region Association: Northern California  |
Hi.
Installed the 914Rubber LED headlight bulds and love them. I do have foglights and they are now "confused" On the site I read "If you have fog lights put enough load on the circuit to trip the switch between high and low beams while the fog lights are on." Say what? What do I need to buy/ how to install? Thanks |
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| Shivers |
Feb 17 2021, 05:40 AM
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#2
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Senior Member Group: Members Posts: 3,335 Joined: 19-October 20 From: La Quinta, CA Member No.: 24,781 Region Association: Southern California |
I'd say that they want you to add a load resistor. Check manufacturer s website for the specs on the correct one, and where they want it. P.S. Resistors can get hot
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| Spoke |
Feb 17 2021, 05:52 AM
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#3
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Jerry Group: Members Posts: 7,370 Joined: 29-October 04 From: Allentown, PA Member No.: 3,031 Region Association: None 
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Check out this thread about LED headlights and interaction with foglights. The OEM 914 has the foglight relay powered in series with the high beam filament. This works for incandescent bulbs but fails with LED headlights.
The simple solution is to parallel a high power ballast resistor across the high beam or modify the wiring to the foglight relay as detailed in the thread. I don't like adding ballast resistors as they burn a lot of power (that you saved going to LED lights) and they can get very hot. 914 LED Headlights + Foglights |
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| GregAmy |
Feb 17 2021, 07:39 AM
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#4
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Advanced Member Group: Members Posts: 2,651 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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Or, rewire your foglight circuit so that it is independent of the low beams:
https://members.rennlist.com/demick/fogrewire.html |
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| DRPHIL914 |
Feb 17 2021, 09:54 AM
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#5
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Dr. Phil Group: Members Posts: 5,907 Joined: 9-December 09 From: Kennesaw, GA Member No.: 11,106 Region Association: South East States
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QUOTE(Spoke @ Feb 17 2021, 06:52 AM)  Check out this thread about LED headlights and interaction with foglights. The OEM 914 has the foglight relay powered in series with the high beam filament. This works for incandescent bulbs but fails with LED headlights. The simple solution is to parallel a high power ballast resistor across the high beam or modify the wiring to the foglight relay as detailed in the thread. I don't like adding ballast resistors as they burn a lot of power (that you saved going to LED lights) and they can get very hot. 914 LED Headlights + Foglights QUOTE(GregAmy @ Feb 17 2021, 08:39 AM) Or, rewire your foglight circuit so that it is independent of the low beams: https://members.rennlist.com/demick/fogrewire.html either of these should work, i did what SPOKE suggested, as i have his LED fog light conversions and i have LED hi/low headlight too and now both work fine and i can have my fog lights on iwht or without the headlamps on. |
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