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Old 06-12-2013, 10:20 PM
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Join Date: Apr 2013
Location: Huntsville, AL
Posts: 6
a few minor W115 electrical gremlins...

Hey guys:

I'm preparing to put my '73 220D back in service as a daily driver and there are 1 or 2 minor electrical things I want to repair over the weekend:

1. The Brake light is on full time. It's full of fluid and the brakes work fine. I think it is related to the emergency brake switch, because if I "bump" the clutch pedal upwards with my foot, I can cause the lamp to flicker and go out temporarily.

How would I access that switch and connection?

2. There is a plug to nowhere that extends out of the top of the black box where the flasher goes. The 3 wires are all light blue, one w/red tracer, one w/ black and one with white or yellow tracer. Any ideas what this is?

3. Why does the foot washer pump have an electrical connection? I replaced mine with a good jy part but hesitated to re-connect the wire until I knew why it has electric to it.

4. Lastly....about that flasher unit- I have two flasher relays that are both hyper. I'd like to upgrade it to a modern electronic relay using a jumper harness with the proper terminals, like I did for the brake light switch. Can anyone advise about which relay works in this case?

Thank you for your help.
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  #2  
Old 06-12-2013, 10:48 PM
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Join Date: Apr 2009
Location: Los Angeles (Altadena)
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Quote:
Originally Posted by TylerW View Post

1. The Brake light is on full time. It's full of fluid and the brakes work fine. I think it is related to the emergency brake switch, because if I "bump" the clutch pedal upwards with my foot, I can cause the lamp to flicker and go out temporarily.

How would I access that switch and connection?
What happens if you wiggle the emergency brake?

Quote:
Originally Posted by TylerW View Post
2. There is a plug to nowhere that extends out of the top of the black box where the flasher goes. The 3 wires are all light blue, one w/red tracer, one w/ black and one with white or yellow tracer. Any ideas what this is?
Unclear as to what you are saying. It sounds like you are talking about the wires that go to the flasher plug. Picture please?

Quote:
Originally Posted by TylerW View Post
3. Why does the foot washer pump have an electrical connection? I replaced mine with a good jy part but hesitated to re-connect the wire until I knew why it has electric to it.
Because when you pump the frog to squirt water on the windows it activates the wipers for a wipe or two.

Quote:
Originally Posted by TylerW View Post
4. Lastly....about that flasher unit- I have two flasher relays that are both hyper. I'd like to upgrade it to a modern electronic relay using a jumper harness with the proper terminals, like I did for the brake light switch. Can anyone advise about which relay works in this case?
A hyperactive flasher is indicative of burnt out light bulbs - the flasher blinks too fast because there is not enough load on it. Typically the flasher/hazard switch/relay will fail either blinking too fast or too slow or not at all or always on. Does this happen when you turn on the hazard lights, or when you turn on left turn signal, or right signal, or all, or none?

You can buy the correct bosch switch/relay from *************** for a semi-reasonable price and you will have the luxury of having the switch light up and blink when the hazard lights are on.
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  #3  
Old 06-13-2013, 09:42 AM
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Join Date: Jan 2006
Location: Tucson, AZ
Posts: 4,554
Unplug the level sensor on the top of the M.C. and see if the light goes out. It's pretty common for the floats inside the M.C. to spring a leak and create a false low fluid condition alert.
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Old 06-13-2013, 11:03 AM
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Join Date: Apr 2009
Location: Los Angeles (Altadena)
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Originally Posted by Mike D View Post
Unplug the level sensor on the top of the M.C. and see if the light goes out. It's pretty common for the floats inside the M.C. to spring a leak and create a false low fluid condition alert.
+1 I forgot about that but I totally agree. Unplug them and see if your light goes out.
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