Battery draw from the Hazard circuit..wtf?? - Defender Source
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  #1  
Old October 18th, 2015, 01:40 AM
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Stephan Laputka
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Battery draw from the Hazard circuit..wtf??

I've spent a solid 6 hours of my Saturday trying to diagnose and fix electrical issues of all kinds on my 95 SW. I've resolved all of them except one..the parasitic draw on the battery. I checked all the circuits and nothing is really suspect except the hazard circuit. With the hazards OFF, i measure 30 milli amps of current. i figured it might be the trailer harness so i unplugged that with no change. I found a wiring diagram from a 1997 NAS (no idea if its the same) and it doesn't seem there is anything else on the circuit for me to check. What I tried:
1. Removing the trailer harness - no effect
2. Pulled the physical hazard switch - no effect
3. strangely- disconnecting the stereo drops the hazard circuit draw by 10ma.
4. Turn signals work fine and there is no draw when they are off as measured at the fuse

So I guess my questions are: what else can I check and does anyone have a wiring diagram for a 1995 NAS?
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  #2  
Old October 18th, 2015, 05:38 AM
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Worst parasitic draw ever was from the alternator as its electronics gradually died. Enough to flatten battery if left fur a few days.
Cured only after it died suddenly and was rebuilt.
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  #3  
Old October 18th, 2015, 08:41 AM
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Check the flasher unit as well. And ground of course.
The draw for the radio is the constant power for clock/stations/etc
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  #4  
Old October 18th, 2015, 08:46 AM
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Samer Hijazi
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Quote:
Originally Posted by Rocky View Post
Worst parasitic draw ever was from the alternator as its electronics gradually died. Enough to flatten battery if left fur a few days.
Cured only after it died suddenly and was rebuilt.

Interesting you mention that. I'm getting a draw similar to what you're describing, as I can hear a low humming noise coming from the alternator when the engine is off.

Was that one of the symptoms you were getting?
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  #5  
Old October 18th, 2015, 10:29 AM
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Samer Hijazi
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Quote:
Originally Posted by sflash868 View Post
So I guess my questions are: what else can I check and does anyone have a wiring diagram for a 1995 NAS?
Here you go.
Attached Files
File Type: pdf Electrical_Circuits_Defender_NAS.pdf (949.1 KB, 27 views)
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  #6  
Old October 18th, 2015, 12:47 PM
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Stephan Laputka
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Quote:
Originally Posted by samer0214 View Post
Here you go.
So this is the one I was using. It says in the diagram that's for a 1997. Does a 97 and a 95 have the same wiring?

As for checking the ground.. you mean the vehicle ground or the ground for that circuit?

Alternator was tested, seemed to function normally.

------ Follow up post added October 18th, 2015 11:51 AM ------

Quote:
Originally Posted by rovertrader View Post
Check the flasher unit as well. And ground of course.
The draw for the radio is the constant power for clock/stations/etc
Should have mentioned that, I did check the flasher unit. I pulled it out and there was no drop in current. As for the radio, it has a face on it that can be disconnected and when I do that I measure a 10ma drop on the hazards circuit, not on the clock/stations. etc. circuit. That makes no sense to me

Worth mentioning, the car has LED signals but they've been on for years and this popped up 2 months ago or so.
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Old October 18th, 2015, 07:00 PM
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If you still have the clock in the middle of the dash next to the hazard switch it continually draws a small current.
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  #8  
Old October 18th, 2015, 09:39 PM
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1995 and 1997 should be the same, for the most part, certainly for the major components, but nothing drastic as to detract you from troubleshooting your problem. There are differences in the ECU (14CUX v/s GEMS) and you MIGHT find minor differences in the A/C wiring and the auto tranny. The good thing is that color codes are consistent across the board when it comes to the defenders. Do you have this, http://www.expeditionlandrover.info/Lucaswirecode.htm and this: http://www.lrfaq.org/series/FAQ.S.wires.html
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