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Old 06-09-2013, 08:15 AM   #1
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Left turn signal lamp mystery

I picked up my MH yesterday and noticed my camera was continuously looping through each view when I would use my turn signal. From a previous post, I noted that someone mentioned a burnt out turn signal lamp could be the cause. Sure enough, my front driver-side turn lamp is not lighting up.

The bulb is fine (I swapped it with the passenger-side working one). I then grabbed my volt meter and measured 10v on the turn signal socket. However, when I put the bulb back in place, the voltage drops down to zero. Other than two running lights (front top), all other lamps work fine when the parking lights are on.

The two wires quickly disappear into a nasty maze of wire wraps, so I'm hoping I don't need to undo it all.

I'm really stumped. Any suggestions?
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Old 06-09-2013, 09:25 AM   #2
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Correction:

Passenger front signal lamp = 11.75v
Driver front signal lamp = 9v (0v when bulb is connected)
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Old 06-09-2013, 09:44 AM   #3
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Okay, I took a measurement from the positive wire to the chassis/battery(-) and found 11.75v. So it seems my ground wire is faulty. I'll do my best to trace the ground wire back (only because I don't know what else is hanging off it) but if I can't find the issue, I'll just run a new wire to the lamp.

Sorry for the play-by-play, but perhaps this will help someone in the future.
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Old 06-09-2013, 09:57 AM   #4
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Quote:
Originally Posted by lochsa View Post
Okay, I took a measurement from the positive wire to the chassis/battery(-) and found 11.75v. So it seems my ground wire is faulty. I'll do my best to trace the ground wire back (only because I don't know what else is hanging off it) but if I can't find the issue, I'll just run a new wire to the lamp.

Sorry for the play-by-play, but perhaps this will help someone in the future.
Good troubleshoot Lou.....
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Old 06-09-2013, 10:41 AM   #5
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Well, not quite... Note the unlit light. Is that my high beam? I can't get either side to come on. Also, where would the fuse be for this?

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Old 06-09-2013, 11:06 AM   #6
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Never mind about the fuses... Found the F53 manual. I'll post the question about the high beams in another thread.

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Old 06-09-2013, 03:29 PM   #7
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Something still is not right. I ended up running a separate ground wire to the signal lamp.

Now the lamp lights when with my parking lights are on however it does not blink when signalling (the break lights do blink). Also, the left side camera never gets selected when signalling. The right does when signalling and the camera no longer loops through each of the views (which is better).

It almost seems like the blinker relay must break the ground circuit when signaling. Does that sound right?
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Old 06-09-2013, 07:10 PM   #8
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Quote:
Originally Posted by lochsa
Something still is not right. I ended up running a separate ground wire to the signal lamp.

Now the lamp lights when with my parking lights are on however it does not blink when signalling (the break lights do blink). Also, the left side camera never gets selected when signalling. The right does when signalling and the camera no longer loops through each of the views (which is better).

It almost seems like the blinker relay must break the ground circuit when signaling. Does that sound right?
Not really the flasher unit is simply a heater switch which makes and breaks 12 volt thru the turn signal lever to the selected side. I'm confused whats not working signal bulbs or marker lamps or both? Any chance the lamps are double filiment originally?, maybe single now?
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Old 06-10-2013, 07:40 AM   #9
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Sorry Vince, let me try to clear it up.

I replaced three marker lights because they rusted out, but they all work now. The high beam issue was no issue, just my lack of understanding (Iggy cleared that up).

I'm still left with my original problem where something is still not right with my front-driver's side turn indicator (the back works fine). The original problem was that it the indicator lamp would not light when blinking or when the parking lights were on. I swapped bulbs with the passenger side to rule out the bulb.

With the parking lights on and the bulb in place, I measured zero volts. When I removed the bulb, I measured 9v. Almost like there wasn't enough current to handle the load of the bulb. I then measured from the pos side of the bulb straight to the negative side of the battery terminal and got the 11.75v. I then tested the bulb (which lit) using this path and assumed there was an issue with the ground wire. Great, the bulb now lights when I turn on the parking lights --- but it still does not blink when I use the turn signal.

The good news is, although the camera doesn't switch to the left view when turning left, it no longer rotates through the views while turning. The camera does show the right side when using the right blinker.

Later this week we're heading out on a 6500 mile trip and so I'd love to clear this up if anyone has any ideas.
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Old 06-10-2013, 08:16 AM   #10
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What is sound like is that you lost a good ground someplace and using one bulb for a path to ground. That is how you get 9 volts instead of 12 volts.
One bulb that is off the circuit is using the bulbs filiment to complete the circuit to ground and is dropping the 2-3 volts thru the bulb to ground. I don't expect you to understand completely but what I would do is find a long wire with try each light socket using it as an alternative ground to a good connection with the chassis or battery ground point.

You would try this one at a time for each marker light location until the additional ground wire until you find where the ground is lost from.

Does this make sense to you? It is not a problem with the battery but a loose ground point some wher ein the front end marker lights.
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