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borochone
P Plater
16 Posts
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 Posted - 06 Sep 2012 : 11:17:12 PM
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hey fellas i have installed a battery cutoff switch into my VN V8 Manual
and i want to somehow supply constant power to the ecu so it doesn't need to relearn every time i drive it?
if anyone could help me with this i would appreciate it since we are all VN nutters
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Mechknight73
National Driver
1001 Posts
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Posted - 08 Sep 2012 : 10:14:02 AM
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| I take it that the cutoff switch is some kind of safety/security feature. Just like your car stereo, a VN's ECU will have a "memory wire;" a lead supplying constant power to the ECU so it doesn't lose its memory every time you turn off the ignition. I'm unsure as to which one this is, but if you can get your hands on a good service manual, it should give you a clue. WARNING: before wiring anything independently of the harness, check to make sure that said wire uses 12 volts, and amperage is not an issue. If it uses less than 12 volts power, you will have to fit some kind of "step down" transformer so it doesn't fry the ECU. |
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borochone
P Plater
16 Posts
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Posted - 09 Sep 2012 : 5:55:23 PM
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| thanks heaps dude, the last thing i want is to fry my comp :) |
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Mechknight73
National Driver
1001 Posts
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Posted - 10 Sep 2012 : 5:19:39 PM
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| There was something that sprung to mind; I remember an old aftermarket idea where a device, powered by a 9 volt battery fed power to the ECU via the cigarette lighter. Can't give you a straight answer as to whether this is some kind of "urban legend" or not, but ask an auto sparky if this idea will work. If you can set up something hidden with a NiCad rechargeable battery, you may have a cheap and easy way to do it. |
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kingbucktoo
P Plater
54 Posts
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Posted - 10 Sep 2012 : 6:06:41 PM
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The wire you want to put you cutout switch in is the ignition sense wire to the ECU: which is powered from fuse #10 to pin A6 of the ECU.
You will need a manual or wiring diagram of this circuit as it also supplies powers the EFI relay and puts 12volts onto the ALDL plug.
This is the method used by Holden when a factory alarm system is fitted . The bypass for the alarm was a key switch in the glovebox.
Look for VN wiring Diagrams on the net, you will get a simplified version with some hints on the colour of the wire to look for an the pin out of the ECU.
I guess this will give the impression of motor cranking but no start when the switch is activated.
Hope this helps |
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ECU Problems.
