9 replies to this topic

[Rubbershorts]

Hi all. My auxiliary fan has a toggle switch on the dash for manual operation. The holder is a bit scrappy and I've been given a replacement by the old guy at the MOT garage. Back in the day he used to have these hung up on a tear card as he said car owners back then used them all the time. It was such a nice gesture I'm set on using it so it's there next time I see him. The current switch needs around a 14mm hole, the switch holder he gave me is nearer 12mm. I don't really want to drill it out. I need a replacement switch but don't know what amp rating I need. Anybody know? Daz.

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[bangermadness08]

I had someone techy install a fan switch, from memory it was a 13a inline fuse if that helps.

[floormanager]

You'd normally wire the fan through a relay, so the amperage going through the switch is small, something like this:-

 

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[Ethel]

More than the wire, or fuse, is rated. Floormanager's info seems on the money 14awg is 2mm²  The fuse will also be what a blade fuse will be marked.

 

You might want to consider the terminals (1/4" spade?) & whether it illuminates too.  

[Rubbershorts]

Cheers guys, this has,as usual, turned into something else. The manual switch to the sensor on the bottom corner of the radiator, has neither a fuse nor a relay that I know of. Previous owner fitted the switch so I'd have to pull it all out to be 100%, but the wire isn't really hidden so I doubt there is. Serious question, how bad a bodge is that?
The battery is disconnected when not using the car, so not in flames at the moment.

[Ethel]

Is it not using the original wiring, if there was a thermal switch? Stalled motors  don't have much resistance, so a fuse is always a good idea where one is involved.

 

Putting a relay in place of, or in tandem with, the thermal rad switch would be the easiest way. You could then tap a live for the manual switch, to operate the relay, of pretty much anything downstream of a fuse. The heater fan switch would be easy, with a piggyback spade.

[Rubbershorts]

Thanks Ethel

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Edited by Rubbershorts, Yesterday, 05:46 AM.

[Rubbershorts]

Thanks Ethel. This pic is just something I found on my phone, as I can't get to the car at the moment. Two red wires piggy backed onto the spades then run into the cab to the above pictured switch.

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Edited by Rubbershorts, Yesterday, 05:45 AM.

[Rubbershorts]

Double post due to the current server issues. Evidently succeeded when it said it failed.

[Rubbershorts]

So this is how it's wired. The switch is on the end of these two large red wires, and when activated simply bridges the two contacts. Is this very wrong/unsafe? If so, how do I rectify it?

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