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856 key switch max amperage?

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J. A.

08-17-2004 18:58:21

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Just how much power can a IH key switch handle? I pull my 790 New Holland chopper with the 856, and have the control box wired directly to the battery. That's a problem, because after a long day, it's easy to forget to turn off the control box. I want to just wire it to the key switch, but I don't want to do any damage. I would guess that the control box pulls a little less than 20 amps, since thats what size circut breaker is in front of it. Will I be alright?

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Captaink

08-18-2004 06:39:37

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Re: 856 key switch max amperage? in reply to J. A., 08-17-2004 18:58:21

I have a 966 with a cab that I did the relay trick on that Bob M mentions. I absolutely love it! If you want a heavyer relay, your CaseIH dealer should have a cab relay available also.

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Bob M

08-18-2004 05:25:15

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Re: 856 key switch max amperage? in reply to J. A., 08-17-2004 18:58:21

If the 856 key switch is like most tractors of it�s era, it�s probably good for 10 � 15 amps max. 20 amps continuous is a borderline overload.

A better solution is to use a relay. Power the relay coil from the IGN or ACC key switch terminal. Run a #12 wire from the battery (or from the alternator side of the ammeter if you tractor has an ammeter) to one relay contact terminal. (For safety to provide a fuse in the line near the battery or ammeter connection.) Then run another #12 wire from the other relay contact terminal to the controller box.

Now the key switch will see only a fraction of 1 amp from the relay coil � the relay will switch the control box power on and off with the key switch. (Added bonus: This setup will also provide slightly higher voltage to the controller box than the key switch can).

For the relay suggest using a fog light relay or similar. These relays are readily available at any parts store, they will easily handle 20 amps and they are cheap!

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