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Author Topic: brake light problems  (Read 867 times)

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Offline Spikeybike

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brake light problems
« on: November 01, 2007, 11:01:09 AM »
so i went for a ride with my bro, 2 miles in he signals me to pull over, telling me i have no brake light .

so we pull over to investigate, and found that my brake light works but it is dimmer then the tail light, so i just assume that i have the wires backwards,
 so i get back home open it all up switch the wires over, and now the tail light is a little bit dimmer and the brake light does nothing at all ......huh?

also when i swapped the wires my headlight got a little brighter (yet another "huh?")

anyone else have this happen cause i'm at a loss , everything is grounded properly and it works, just not how it should

my brake light switch is oringial 1975 do they cause that when they start to go bad
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Offline OldSchool_IsCool

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Re: brake light problems
« Reply #1 on: November 01, 2007, 12:37:25 PM »
Check the voltages at the bulb/socket.  If they are say 1, 2 or more volts below BATT, then you likely have a corroded connection somewhere.  Corrosion is resistance and current flowing thru resistance makes for a voltage drop.  Ideally, the only resistance "load" in your lighting circuit should be the filament of the bulb.
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Offline Spikeybike

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Re: brake light problems
« Reply #2 on: November 01, 2007, 01:01:01 PM »
ok so i dug deeper and here is what i found , the PO wired the tail light and the low beam (headlight) together  ??? ::)
witch wasn't that big of a deal i assume ... until i relayed the headlight , witch inturn relayed the taillight (and not the brake light) with explaines why my headlight got brighter.  so knowing this , my first qustion is , why would you run the taillight off the headlight (assumeing there is some sort of reason behind doing this) ,and what would be the best fix
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Offline Spikeybike

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Re: brake light problems
« Reply #3 on: November 02, 2007, 11:02:12 AM »
as if this couldn't get any more strange.

i re-ran the wires back to stock no sweat, i check the light and had the same problem again WTF
so i'm looking at the bulb itself while applying the brakes , and i notice that there is one filament lit , and when i hit brakes that same filament gets brighter  ???

   so to end this story the tail light housing had a bend in it witch caused it to ground somewhere , anyway i replaced the whole thing and now it works fine .... crazy
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