Battery kill switch and ECU - Defender Source
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  #1  
Old December 28th, 2008, 09:16 PM
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Question Battery kill switch and ECU

I am installing a battery kill switch and wanted to know if the power is cut from the ecu, will it cause any problems (with the ecu)? I saw a product from Noco, called a Settings Saver that looks interesting. Basically, it plugs into the cig lighter, and with its 9v battery, it pumps out just enough juice to maintain the ecu settings and the radio settings. Your thoughts?

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  #2  
Old December 28th, 2008, 11:25 PM
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Would not bother me for the ECU to reset every time.
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  #3  
Old December 29th, 2008, 01:58 AM
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Doug Walker
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No issues with the ECU. Fault code #02 shows, but erases itself on the next re-start. #02 means 'improper shutdown'. ECU memory of engine dynamics is nothing to worry about.
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  #4  
Old December 29th, 2008, 07:10 AM
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Len Cater
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And of course you're installing the cutoff for ease of battery dis-connect and some theft protection. I find my idle takes about 20 minutes to get figured out properly after I use my battery dis-connect. Install it where you won't accidently kill the power while driving (i.e. in front the sear box is a natural spot but suspect to kicks by your foot as I found out).
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  #5  
Old December 29th, 2008, 07:56 AM
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In a 1993-1995 you can use a cut off switch with no issues at all.

In a 1997 you can too, but you have to wait about 30 seconds after you shut off the car before turning the battery switch off. This is the time period when the GEMS EFI computer stores its parameters. If you don't wait then it will run like crap for a time until it relearns everything. You can here the ECU relay drop out if you listen close. Turn off the car and then wait 20-30 seconds and you will hear a click from the relay. Once the relay drops out you are fine to flip the battery switch and you won't have any ill-running issues next time you start the truck.
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Old December 29th, 2008, 08:35 AM
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Mike,

Good point on the 1997, I saw he had a 1995 so I did not mention it.

Ron
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Old December 29th, 2008, 11:50 AM
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Question

Quote:
Originally Posted by ECR
In a 1993-1995 you can use a cut off switch with no issues at all.
Thanks Mike!

Would using the Noco Settings Saver hurt my ecu?

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  #8  
Old December 29th, 2008, 05:31 PM
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Quote:
Originally Posted by evilfij
Mike,

Good point on the 1997, I saw he had a 1995 so I did not mention it.

Ron
But I do have a '97 with a kill switch so this helps me out. Of course not when I kick out the plug with my foot.
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Old December 29th, 2008, 10:35 PM
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Yes, but you posted after I did so how was I to know you would be concerned with all this?

;-)

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  #10  
Old December 30th, 2008, 11:30 PM
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Question Another question for you, especially D110 owners.

Thanks to all for your comments!

Another question for you, especially D110 owners. I reviewed the electrical section in my LR workshop manual for 93-95 NAS Defenders, and the Starting System Circuit for Defender 110 diagram shows the battery isolator switch (battery cut-off switch) is wired to the (-) ground. Is this correct? What is the stock switch rated? The swich I bought is rated for 100amps.

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Old December 30th, 2008, 11:49 PM
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Yes, it is wired on the negative side. I have no idea what the switch is rated for, but 100 seems pretty low. You should be able to find a much heavier duty switch for about $50, especially if you are going to be doing any winching.
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  #12  
Old December 31st, 2008, 12:53 AM
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No winching. The only extra juice needed would be for my 2 Hella 550's. BTW, the main fuse is 60A. Wouldn't anything above that blow the fuse?


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Old December 31st, 2008, 01:04 AM
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Just put a 1 Amp fuse in parallel with the kill switch. It'll keep the ECU and radio settings alive, but it'll pop if anyone tries to start the engine.
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  #14  
Old December 31st, 2008, 12:49 PM
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Quote:
Originally Posted by xrover
And of course you're installing the cutoff for ease of battery dis-connect and some theft protection. I find my idle takes about 20 minutes to get figured out properly after I use my battery dis-connect. Install it where you won't accidently kill the power while driving (i.e. in front the sear box is a natural spot but suspect to kicks by your foot as I found out).
Do you get an engine check light during this time? I have noticed since I put in my kill switch that the truck runs fine for about 15mins or so and then I get an Engine Check Light and the idle gets a little rough.

B
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  #15  
Old December 31st, 2008, 02:26 PM
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Question

That's strange...

I wonder if D110 owners experience the same? I also question why LD did not offer the battery isolation switch on D90s...
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  #16  
Old December 31st, 2008, 02:38 PM
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My kill switch causes no check engine lights on my 110. It is very handy for reseting ECU error codes. I don't use it much but it works flawlessly.
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  #17  
Old December 31st, 2008, 04:00 PM
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Quote:
Originally Posted by wcampbel@nas.edu
Do you get an engine check light during this time? I have noticed since I put in my kill switch that the truck runs fine for about 15mins or so and then I get an Engine Check Light and the idle gets a little rough.

B

He was talking about a 1997 90 and that can have idle issues in regards to a battery switch (if turned off too quickly the ECU forgets itself).
In your 94 (different type of EFI system) there should be no connection ( no pun intended) between a check engine light/ rough idle and a battery switch.
When the light is on read the fault code on the code reader and that will point you in the right direction.
Shouldn't have anything to do with the switch.
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  #18  
Old January 2nd, 2009, 11:34 AM
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Quote:
Originally Posted by ECR
He was talking about a 1997 90 and that can have idle issues in regards to a battery switch (if turned off too quickly the ECU forgets itself).
In your 94 (different type of EFI system) there should be no connection ( no pun intended) between a check engine light/ rough idle and a battery switch.
When the light is on read the fault code on the code reader and that will point you in the right direction.
Shouldn't have anything to do with the switch.
Gracias, thanks for the info.
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