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Old Mar 8, 2007 | 01:04 PM
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battery shut off

Hi All; Would it be possible to install a starter solinoid between battery and original solinoid and hook it up to a rocker switch to use as a switched battery shut off? Or maybe better yet between starter and starter solinoid?
Thanks for you patience here, i`m just exploring some ideas. Gusso
 
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Old Mar 8, 2007 | 01:58 PM
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Yes you can, but you need something better than an ordinary starter solenoid. You would need something that is rated for continous duty. A regular starter relay is only rated for a short time periods of use.

They also make manual switches that mount to the battery that do the same thing. But you have to lift the hood to operate these.
 
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Old Mar 8, 2007 | 06:22 PM
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Thanks Dave. I`ll try to locate a continous duty solenoid. If anyone knows where
they can be bought, please let me know. In the meantime I`ll start looking.
Thanks again, Dave. Gusso
 
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Old Mar 8, 2007 | 11:28 PM
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Stinger car audio makes a 250 amp relay you could use for this.
 

Last edited by SPL Tech; Mar 8, 2007 at 11:30 PM.
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Old Mar 9, 2007 | 01:01 AM
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Don't series wire your shutoff and the starter solenoid. Every switch or relay contact has a voltage drop across it.
 
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Old Mar 9, 2007 | 02:12 AM
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Eric; I dont understand then. How would you wire it? Gusso
 
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Old Mar 9, 2007 | 01:53 PM
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It depends on what you are trying to accomplish. If you want to truely disconnect the battery completely, you will have to wire it in series, and you will experience a little bit of voltage drop, but probably not enough to hurt anything. You will also be adding another component that can fail along with more connections to corrode. But most everything in life is a trade-off and you have to live with some things.
 
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Old Mar 9, 2007 | 02:07 PM
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Dave ; In searching for a continous duty solenoid I ran accross a latching solenoid.
If I used one of these would I still get a voltage drop, if wired in series?
 
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Old Mar 9, 2007 | 04:46 PM
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Yes. A latching relay still has contacts in the current path.

The quality of the device, and the quality of your connections will be the most determining factors in voltage drop. Poor quality undersized solenoid(relay) and small wiring with poor connectors will aggravate voltage drop.

But, unless you have an extreme current draw from starting a large high compression engine, it will probably work ok.
 
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Old Mar 9, 2007 | 06:05 PM
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Cole Herse makes numerous continous duty solnoids. They are used in lots of marine applications. They are the products repackaged in many kits. Napa should be able to supply. Don
 
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Old Mar 9, 2007 | 06:14 PM
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No need to wire them in series. The starter relay has to be energized from the main electrical system to work. So as long as everything else is shut off the starter solenoid can't energize.
 
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Old Mar 9, 2007 | 07:56 PM
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Torque1st; If this were installed between the starter and starting solenoid I
believe you would have power to energize, but I`m a long way from being a wiring expert. I`ll have to hook it up to see. Thanks all for info. Anyone else want to weigh
in on this subject, please do.
 
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Old Mar 10, 2007 | 05:03 PM
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Look it up????? Do you understand series and parallel circuits? Do you understand electrical switches and relays? You really need a basic understanding of electricity before you modify or change things. Perhaps it would be better to hire someone to build and wire your system before your vehicle burns to the ground.
 
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Old Mar 10, 2007 | 05:37 PM
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Torque1st.

Thanks.
 
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Old Mar 10, 2007 | 05:45 PM
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Originally Posted by gusso
Dave ; In searching for a continous duty solenoid I ran accross a latching solenoid.
If I used one of these would I still get a voltage drop, if wired in series?

Yes. It does not matter what you use or how much it costs. A $10,000 solenoid rated for 50,000 amps will have a voltage drop across it. Generally the main drop is at the contact points on the solenoid where you attach the wire and at the ring terminals you put on the end of the wire.

 
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