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Junior Charter Member
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3,131 Posts
Discussion Starter · #1 ·
Am running the stock FFR rear lights, brakes on top and turn signal on the bottom, both with running lights. My question, if I put a jumper with a diode from the brake lead to the turn signal lead, will it go bright with the brake input and then brighter with the turn signal input, or will it burn out? Thanks in advance. Pete
 

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Premium Member
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10,650 Posts
No and it won't burn out. 12v is 12v, they will not add, but simply make a parallel path for the current.
 

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What's a 'n00b'?
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387 Posts
Like Mark said, the bright filament is the same brightness no matter how you get 12V to it. With the diode drop there would technically be a little lower voltage when the brake line energizes the turn signal light, but you won't be able to see the difference.

If you wanted a different brightness you could come up with a way to do it but I assume you actually don't want that?
 

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Junior Charter Member
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Discussion Starter · #4 ·
OK, I understand. Is there a way to wire my current setup to get all four rear lights to work as brake lights and also have the turn signals work? Pete
 

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Official OLD GUY
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3,874 Posts
RadarPete,

Yes, there is a way to wire your brake / tail / turn signels to do what you want.

You'll need two DPDT relays (make sure they don't have the NO-NC contacts tied together).

The bulbs get wired to the common contact, the brake circuit gets wired to the normally closed contact and the turn signal gets wired to the normally open contact (kinda in reverse of the normal way to wire a relay).

When the brakes are applied, power is supplied to the normally closed contact - to common - to the bulb (all four thru two relays).

When a turn signel is activated, one (rt or lf) relay switches to the normally open contact (now closed) and power is supplied to the bulbs (2, upper and lower on the side activated) thru your flasher.

All of this is independant of your park lights.

Emergency flashers are accomplished by wiring in a DPST switch that pulls in both relays at the same time, making all four bulbs flash at once.

Fronts are tied to the turn signel circuit only, as are your indicators.

NO diodes required.

I have drawings if needed.

My wiring circuit does not cancel by itself. If you want automatic cancel, do a search for DarkWater Customs wiring diagrams, he has a real nice timer circuit on his website.

I am presently working on my own cancelling device using latching relays and a timer for flasher.

Or . . . . .

Get one of those $100.00 motorcycle timer/turn signel devices to replace your flasher.

HTH

Doc
 

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Senior Member
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2,990 Posts
I used a converter box or what’s called a Hoppy adapter to change the 5 wire rear light setup to a 4 wire which is what I think you want. It is commonly used to wire a plug for trailer lights. I have it so all 4 rear lights are break lights and 2 on each side are turn signals. I tried the non powered Hoppy adapter first and all worked fine until I turned on the emergency flashers so I had to change it out and get the powered Hoppy adapter. Below are some links to previous topics that might help.

http://www.ffcars.com/ubb/ultimatebb.php/ubb/get_topic/f/1/t/080777.html
http://www.ffcars.com/ubb/ultimatebb.php/ubb/get_topic/f/1/t/078492.html
http://www.ffcars.com/cgi-bin/ultimatebb.cgi/ubb/get_topic/f/58/t/009711.html?
http://www.ffcars.com/cgi-bin/ultimatebb.cgi/ubb/get_topic/f/58/t/001980.html?
 

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Premium Member
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10,650 Posts
Get a powered trailer converter from any auto parts store (even Walmart). The directions are pretty straight forward and you will be good to go!
 
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