Ignition Switch Heating Up

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Ignition Switch Heating Up

Postby charlie63 » Tue Jun 19, 2018 7:51 pm

I noticed today when I had my tractor running the ignition switch seemed to be heating up and was warm to touch as well as the surrounding area of the dash at the ignition switch area. It is a combined light/ignition switch and the lights were not switched on at the time. I wouldnt have thought this to be normal. Has anyone else come across this. Just to be on the safe side I have disconnected the battery whilst it is sitting.
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Re: Ignition Switch Heating Up

Postby Mervyn Spencer » Tue Jun 19, 2018 9:03 pm

Have you checked for any loose connections or bridging of connectors. Just another thought you could do a process of elimination by disconnecting individual wires to prove where the problem may be?
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Re: Ignition Switch Heating Up

Postby charlie63 » Wed Jun 20, 2018 6:52 pm

Mervyn,
Had another look at it today. Rechecked all the terminals and all are tight. No sign of burning either. I reconnected the battery again and checked to see if the switch was heating up when just sitting with everything off. It seems that it is heating up only when the ignition switch is on and the tractor running.
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Re: Ignition Switch Heating Up

Postby Mervyn Spencer » Wed Jun 20, 2018 8:24 pm

Hi Charlie, you mentioned that your switch was a combination of ignition and light. I do recall some time ago someone mentioning that over time rain water enters the switch and thus causing corrosion, how about squirting some wd40 or equivalent into the barrel, maybe you have already tried that? The other thought is to feel if any one wire is getting warm and if so identify where it is going, sounds like low insulation somewhere. I hope you can get the problem sorted.
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Re: Ignition Switch Heating Up

Postby MikesDexta » Wed Jun 20, 2018 10:28 pm

Hi Charlie
Heat is caused by excessive current draw and a bad connection draws excessive current - so I advise checking all connections including crimping on the back of your switch. Alternatively the switch itself maybe failing and causing a partial short circuit which would draw excessive current and generate heat. If it was a dead short circuit I would expect smoke or something coming on that shouldn't ...

cheers

Mike
1959 Dexta
I'm not retired just re-deployed
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Re: Ignition Switch Heating Up

Postby Bensdexta » Thu Jun 21, 2018 12:58 am

If you have a multimeter, you could investigate to see where the current is going.
Bensdexta - 1961 working for a living!
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Re: Ignition Switch Heating Up

Postby charlie63 » Fri Jun 22, 2018 7:45 am

Thanks for the replies guys. It is a brand new switch and hasnt been exposed to any rain or water. I will have another look and recheck all the crimped connections and check everything with a meter again. Will report back on my findings.
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Re: Ignition Switch Heating Up

Postby charlie63 » Wed Dec 05, 2018 7:24 pm

Well after a bit of debating with myself I decided to remove the combined ignition/light switch and have replaced it with a genuine Lucas 4 position light switch SPB 107 and a separate Durite On/Off ignition switch. It meant making up brackets for the control box to sit behind the dash to one side to allow room for the ignition switch. I removed the mounting bracket from the combined switch which was only fitted on with 2 rivets and fitted to the new light switch to allow it to be fitted to the dash and then painted it black so it looks nice and tidy. Once the bracket was removed from the old switch I was able to dismantle the switch and found the internals were all corroded so it obviously had some water ingress from me washing the tractor and then corroded with it sitting. No wonder the ignition switch was sticky and problematic to switch on. Thats what I get for purchasing cheap and nasty reproductions. Will post more pictures to show everything fitted into place once completed.

Switch with original mounting bracket fitted and painted.

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Terminal Setup.

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Light Switch fitted to lower dash.

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Ignition Switch fitted to lower dash panel.

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