The discussion centers on the application and functionality of a battery cut-off switch in vehicles. A battery cut-off switch is designed to disconnect the battery to prevent discharge when the vehicle is off, but it also poses challenges for operating certain electrical functions, such as hazard lights, when the switch is engaged. Participants emphasized the importance of understanding vehicle wiring and the potential need for modifications, such as using blocking diodes, to achieve desired outcomes. Additionally, it was noted that disconnecting the battery while the engine is running can cause voltage spikes, which can damage the vehicle's electrical system.
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How to apply Battery cut off switch on a vehicle..??
I want to make some electric functions to be operated if the battery is cut off.
phinds said:Your question is completely unclear.WHAT battery cutoff switch? What is it on? What are you talking about?
Normally a "cutoff" means exactly that ... it cuts something off (not physically cut, but "turned off")
CWatters said:Yes that's the idea, however it might not be a simple job...
The battery side of all the fuses is probably connected together - perhaps by a track on the printed circuit board that mounts the fuses. So if you just connect power to the battery side of the hazard light fuse it will "back feed" to all the other fuses so everything will get power. You might need to insert a blocking diode or modify the wiring in other ways.
There might also be issues with the system that detects if a bulb has blown.
On modern cars disconnecting the battery can also cause issues for things like the radio and the alarm.
Ok, this post shows me that you have a lot to learn about automotive electrics. You cannot expect answers with your current level of understanding. First thing to always remember is to NEVER DISCONNECT A VEHICLE BATTERY WHILE THE ENGINE IS RUNNING! This will cause the system voltage spike well above operating voltage due to the nature of the charging system.AM1990 said:For my case there would be another problem that if we cut the battery off when the engine has been started then other equipment would be turned off. But at that moment If ignition switch is turned off, then switch/engine will not stop as no power would be there to operate ignition switch/motor (or may be it called stater motor). In that case how I can turn my engine off..?? should i supply power from Alternator to ignition switch..?
what should I do?
This makes no sense. The starter is there to spin the engine in order to draw fuel and air in and start the process. It has nothing to do with shut-down. You are wandering into such unfamiliar territory that I believe you will become very confused and discouraged if you don't stop and learn some basics first. Or worse yet you will become hurt.no power would be there to operate ignition switch/motor (or may be it called stater motor).
We could only guess.AM1990 said:But If you completely cutoff the battery (power from battery) by turning off the cutoff switch, then no electric equipment can be operated until or unless cutoff switch is turned on.( I am not sure whether ignition switch works or not)
On some vehicle, hazard light and back lamp still be operated if cutoff switch is turned off.
I want to know how do it works..??
yes you are right.Averagesupernova said:Ok, this post shows me that you have a lot to learn about automotive electrics. You cannot expect answers with your current level of understanding. First thing to always remember is to NEVER DISCONNECT A VEHICLE BATTERY WHILE THE ENGINE IS RUNNING! This will cause the system voltage spike well above operating voltage due to the nature of the charging system.
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I have no idea what you are talking about referring to This makes no sense. The starter is there to spin the engine in order to draw fuel and air in and start the process. It has nothing to do with shut-down. You are wandering into such unfamiliar territory that I believe you will become very confused and discouraged if you don't stop and learn some basics first. Or worse yet you will become hurt.