Momentary switch for automotive use

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  #1  
Old 09-17-13, 08:19 PM
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Momentary switch for automotive use

Can I use one of those momentary switches to trigger a relay? I don't know what the rating are for those switches but I have a bag full of them and need to close a relay so i can ignite my truck with an auxiliary battery

http://origin.kaboodle.com/hi/img/c/...=1301564275000
 
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Old 09-18-13, 03:12 AM
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Pretty hard to say without more info. Try it if it burns the switch up you have more.
 
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Old 09-18-13, 04:04 AM
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It's probably rated at 1 to 5 amps. A standard auto relay takes about 100 ma. of coil current so you should be safe using that switch.
 
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Old 09-18-13, 05:54 AM
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Great thanks for the replies
 
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Old 09-18-13, 09:17 PM
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One more question I have a total of 3 switches to install 1 momentary and 2 rocker switches. They will be all side by side Can I have the Ground wire jump from one to another switch in series or should I split the ground wire 3 way to each switch (parallel). Also looking for a solution for the power cable If I should split it or run it in series across the 3 switches!!
 
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Old 09-18-13, 09:24 PM
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It sounds like you'll end up with ground and power on the switches. That may not work out to well.

It doesn't matter if you loop the wire from switch to switch or if you take a short piece of wire from each switch and combine them together.
 
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Old 09-18-13, 09:43 PM
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The switch you displayed is designed for an electronics application as in a Radio Shack kit or something like it. The typical use in an automotive application will be in my opinion to harsh. There are switches made specifically for the purpose that arn't really expensive at all. I guess the qestion is how long do you want it to work before you have to fix it.
 
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Old 09-19-13, 05:39 AM
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But isn't the way to wire a rocker switch? The ones I have are the illuminated ones. Usually ground on the brass colored tab, accessory on the middle tab and power on the other tab?
 
  #9  
Old 09-19-13, 06:00 AM
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I kind of noticed it it looks flimsy compare to the other 2 rockers switches I bought
 
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Old 09-19-13, 08:53 AM
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You didn't mention that the switches were illuminated.

The pushbutton in your link will work just fine for activating a relay.
 
  #11  
Old 09-19-13, 01:46 PM
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o

Like I said before we need more info. We dont know what we are working on,what we are turning on,why there is a second batt , what the voltage is,what the load is, your just assuming and guessing. If this is a black opp project maybe we shouldn't get involved. .we might be helping someone make a car bomb. Wait,,,,,,,I think I see a black helicopter.
 
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Old 09-19-13, 07:13 PM
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LOL it's for my Ford E350 I think the previous owner had a fridge and some other stuff at the back so in case the main battery dies you can flick the relay so you can start the engine with the other battery
 
  #13  
Old 09-19-13, 11:31 PM
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The first diagram is a basic circuit. You can use a starter solenoid or a continuous duty solenoid. The 5a fuse protects the wiring.

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In this diagram you can use the pushbutton to activate a continuous duty solenoid for jump starting or when you start the vehicle the solenoid is engaged to charge the second battery. The two diodes are used as blocking diodes so that there is no reverse flow.
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You must use a continuous duty solenoid (like one from Cole Hersey) as it will be energized for long period in the second diagram.

In the first diagram you can use a basic starter solenoid as it's only energized for a short duration.
 
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Old 09-20-13, 06:36 AM
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AWESOME!!! Thanks a lot PJmax
 
  #15  
Old 09-20-13, 07:37 AM
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I wonder if it was set up to charge the aux batt then isolate it so you wouldnt discharge the main batt?
 
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Old 09-20-13, 08:33 AM
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Good question r. wrench.

Audiotek..... does the battery currently charge from the vehicle ?

If it does you may already have a relay system installed.

Otherwise they may have used a diode charge block. That would be a metal case with fins and 3 bolts with connecting wires on it.
 
  #17  
Old 09-20-13, 10:14 AM
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If the relay stayed engaged continuously when the key was in the run position the battery would stay charged where if the key were off or in the acc. pos. the batteries would be electrically separate
 
  #18  
Old 09-20-13, 11:09 AM
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If the aux. batt was to start the truck there would have to be batt cables comming from it. Ill bet there isn't.
 
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