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Author Topic: Defies all logic....  (Read 14320 times)

Offline Conrad325i

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Defies all logic....
« on: March 19, 2016, 12:48:40 AM »
So my tail light wont light up.

I can take the bulb and put it on a 9V battery and it lights up.
I measure 8.75V across the 9V battery.
I then can measure 8.25V across the two wires for the tail light.
When i connect the bulb it wont light up.

Its a 5007 sylvania bulb.

And i know its not the connection because i can touch the two wires together and the BMU indicator will turn off.
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Offline Martin

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Re: Defies all logic....
« Reply #1 on: March 19, 2016, 01:18:17 AM »
Make sure the spring loaded base is pushing up and making contact. Try another globe. Or have you run over any Gypsies or black cats. :dunno
Regards Martin
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Offline Conrad325i

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Re: Defies all logic....
« Reply #2 on: March 19, 2016, 02:17:42 AM »
I think im going to buy a lower wattage bulb rated for lower volts and try again.

It was making good contact so idk.

And haha i think the house i live in is haunted, if that counts hahaha
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Offline Laitch

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Re: Defies all logic....
« Reply #3 on: March 19, 2016, 07:59:40 AM »
Quote from: Conrad325i on March 19, 2016, 02:17:42 AM
I think im going to buy a lower wattage bulb rated for lower volts and try again.

You've got the wrong bulb. You should have a 10W R10 or its equivalent in there. Don't go dimmer. Where did you get the 5007 spec?
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Offline Conrad325i

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Re: Defies all logic....
« Reply #4 on: March 19, 2016, 10:56:44 AM »
Honestly there wasnt an old bulb in there to begin with so i just bought one that looked like it would fit.
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  • 1986 K75C
-Isaac
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Offline Conrad325i

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Re: Defies all logic....
« Reply #5 on: March 19, 2016, 11:17:54 AM »
Advance doesnt have an R10

Will a 63 or a 67 work?

7V,4.4W and 13.5V, 8W respectively.
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  • 1986 K75C
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Offline Conrad325i

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Re: Defies all logic....
« Reply #6 on: March 19, 2016, 11:43:07 AM »
Tried both. Neither works.

This is just mind boggling. A light bulb is a light bulb. The only thing i can think of is that although we have a good potential difference across the connectors the wiring back there cant pass enough current to light the filament?
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Offline Chaos

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Re: Defies all logic....
« Reply #7 on: March 19, 2016, 12:20:55 PM »
if you are getting current at the socket, ground and pos, seem like it would be bad contact, try sanding the contacts and some dielectric grease.  Also check continuity through the bulb on the socket with the lights off.  I always thought the lights should be getting battery voltage, not the 8+ volts you mentioned.
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Offline TrueAce

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Re: Defies all logic....
« Reply #8 on: March 19, 2016, 01:19:33 PM »
10-4 with Chaos. Voltage ain't right.
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Offline K1300S

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Re: Defies all logic....
« Reply #9 on: March 19, 2016, 01:54:55 PM »
Quote from: Conrad325i on March 19, 2016, 11:43:07 AM
Tried both. Neither works.

This is just mind boggling. A light bulb is a light bulb. The only thing i can think of is that although we have a good potential difference across the connectors the wiring back there cant pass enough current to light the filament?

A bulb is not a bulb.  They all have different spec contacts.   You have to use the bulb the socket is designed for.

And there should be 12v in the socket.
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Offline Conrad325i

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Re: Defies all logic....
« Reply #10 on: March 19, 2016, 09:59:42 PM »
i dont think its inconcievable that there is a 30% voltage drop thru a few feet of 22ga wire.

Will someone go put a multimeter on thier bulb housing and tell me what you get?

Also as far as contact goes....
I crimped brand new connectors on the wires and then touched them to the bulb, circuventing the little bulb holder, and they still didnt light up.
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  • 1986 K75C
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Offline johnny

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Re: Defies all logic....
« Reply #11 on: March 19, 2016, 10:11:22 PM »
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Offline Chaos

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Re: Defies all logic....
« Reply #12 on: March 19, 2016, 11:19:14 PM »
my 30 yr old K has 11.55V at the license plate light, 12.55 at the battery.  Are you close to a black hole that could be sucking away all the photons?
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Laitch

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Re: Defies all logic....
« Reply #13 on: March 19, 2016, 11:53:34 PM »
Quote from: Conrad325i on March 19, 2016, 09:59:42 PM
Will someone go put a multimeter on thier bulb housing and tell me what you get?
I think the best way to work this is for you to get a multimeter and tell us what you get, Conrad. Start with the bulb socket and work your way through the wiring. You can get a wiring diagram from the one of the shop manuals in the Technical Library Card Catalog.

Another way would be to get one of these and put in your request
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Offline Chaos

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Re: Defies all logic....
« Reply #14 on: March 20, 2016, 12:26:04 AM »
Quote from: Laitch on March 19, 2016, 11:53:34 PM

Another way would be to get one of these and put in your request

that won't help with black holes


and I just lost all respect for Amazon
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Laitch

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Re: Defies all logic....
« Reply #15 on: March 20, 2016, 12:29:09 AM »
O thou of little faith, wherefore didst thou doubt?
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Offline Chaos

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Re: Defies all logic....
« Reply #16 on: March 20, 2016, 12:36:23 AM »
my guardian bells trump you holy rags
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  • sw ohio
1987 K75S    VIN 0231
Original owner, Original litter
200,000 miles (plus or minus) and 5 paint jobs
sold 6/23
2023 Ural 2WD sidecar (BMW's bastard step child)

Offline Laitch

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Re: Defies all logic....
« Reply #17 on: March 20, 2016, 12:37:29 AM »
Pride goeth before a fall.
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  • Along the Ridley in Vermont.
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Offline Conrad325i

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Re: Defies all logic....
« Reply #18 on: March 20, 2016, 12:52:50 AM »
Haha since i can see the multimeter is reading 8.25v at the bulb socket... The photons are all there, we have yet to rule out if the black hole is pulling the electrons back to the front of the bike thru the wire haha.

I guess ill deal with this tomorrow seeing as its gonna rain all day.

Also... Does anyone know who Opie's mom is on Andy Grifith? Did she die or what?
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  • 1986 K75C
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The Hills and Valleys of East Tennessee

Offline Laitch

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Re: Defies all logic....
« Reply #19 on: March 20, 2016, 01:04:17 AM »
Quote from: Conrad325i on March 20, 2016, 12:52:50 AM
since i can see the multimeter is reading 8.25v at the bulb socket
That's weak.
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Offline rbm

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Re: Defies all logic....
« Reply #20 on: March 20, 2016, 01:59:50 AM »
Quote from: Conrad325i on March 19, 2016, 09:59:42 PM
i dont think its inconcievable that there is a 30% voltage drop thru a few feet of 22ga wire.
small point but K100 wiring is 1.5mm generally, which is 16GA wire, not 22GA.  The voltage drop on 16GA wire over distances of 10-12 feet is minimal.
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Offline The Mighty Gryphon

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Re: Defies all logic....
« Reply #21 on: March 20, 2016, 09:27:05 AM »
I think Opie's mom was doing time in the North Carolina women's correctional facility in Mayberry for lewd and lascivious behavior.  I am pretty sure I saw a drive in movie back in the 70's based on her time there.
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  • In my garage in Marilla, NY
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Offline Laitch

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Re: Defies all logic....
« Reply #22 on: March 20, 2016, 09:43:46 AM »
Quote from: The Mighty Gryphon on March 20, 2016, 09:27:05 AM
I am pretty sure I saw a drive in movie back in the 70's based on her time there.
I saw it, too—They Lust In Stripes.
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  • Along the Ridley in Vermont.
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Offline The Mighty Gryphon

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Re: Defies all logic....
« Reply #23 on: March 20, 2016, 09:58:01 AM »
Yeah, that's the one.  The obligatory mess hall riot scene was a classic.  Couldn't believe how easily the tops of those prison uniforms came apart.  :eek:  Not that I'm complaining...
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  • In my garage in Marilla, NY
  • '91K100RS White/Blue
Current:
'91 K100RS16V "Moby Brick Too"

Past:
'94 K75RT "Ilsa, She Wolf of the SS"
'92 K100RS16V "Moby Brick" (RIP, deceased in a vehicular assault)
'94 K75S Special Edition Dakar Yellow "Cheetos"
'89 K100RS Special Edition "Special Ed"

Offline Laitch

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Re: Defies all logic....
« Reply #24 on: March 20, 2016, 10:01:32 AM »
Opie's mom sure knew how to use her whittling shiv to back off that 300lb gang leader.
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  • Along the Ridley in Vermont.
  • 1995 K75 89,000 miles
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