Chopshop85

iTrader: (4)

I have twin fans on my front mount, one wired to the thermo, the other on a switch in the car as the two on the std loom would keep popping fuses.

Looking to change that and I'm sure someone on here had a loom diagram for the fans? Using better wiring etc to replace the original fan loom so I don't have to worry about my fan switch any more.

Cheers.

Karlos G

iTrader: (4)

Just put a relay in line for the live, a dedicated earth direct to the battery and use the fan switch to switch the relay on and off... Easy!

Chopshop85

iTrader: (4)

lol you say easy, electrics are my worst enemy!

Karlos G

iTrader: (4)

lol I'm sure you can manage it Matt!

Steve Escos

iTrader: (18)

I have replaced all my fan loom with a seperate new cosworth loom. Fed direct from the battery, you will need to swap either the connections or the temp switch and has the ability to run a switch to run manually.
http://www.ebay.co.uk/itm/RS-Coswort...item257314ed5b

martysmartie

iTrader: (1)

You want to keep the automated system!

I would have thought new fans are a lot more efficient than the OE ones though, i.e. draw less power, it can't be worse than the OE ones!

When it was blowing fuses did you have them both running manually?

Martin

Chopshop85

iTrader: (4)

^^ sorry only just saw this reply.

Now the fans were running auto on the thermostat. But with both of them it kept blowing the fuse. That's why I decided to just wire one to a switch inside the car on a separate wire so the original fan loom is only controlling one fan.

essexRSTSouthend

I've never had this issue and i'm using original loom and msd upgrade switch.
Maybe another problem causing fuse to blow. Make sure its the correct amp fuse and even up the fuse by 5 amp..

Roscopeco

iTrader: (1)

I spoke to auto sparks the other day and he said with twin spal fans the original wiring should be more than upto the job as they dont draw as much much current and are far more efficient

martysmartie

iTrader: (1)

What is the rating of the fuse?

You can't simply up rate the fuse, and by doing could actually be dangerous, as the wiring may not be able to cope with the additional draw, especially when you consider it's age!

Martin

martysmartie

iTrader: (1)

That maybe true enough, but imo I think I would be tempted to rewire (consider the age of the wiring), if it's anything like the Sierra fan loom, it's a terrible design, well lack of design I should say!

The switch's used have the totally wrong span as well, so in the Cosworth's case the fans come on too early and stay on forever which causes melted fuses etc and even fires, and in the case of the ERST, IIRC, it's the complete opposite lol, in that the fans activate too late and don't stay on for long enough?

To this end this is why an "Uprated" switch should be essential where the fans are concerned imo, certainly in the Cosworth's case from experience, can't comment on the RST'S.

Martin

Chopshop85

iTrader: (4)

I'm sure modern fans don't use as much juice, however I'm using the ones that came with my airtec several years ago. I'm going to get a new loom sorted out I think as I sometimes forget about my manual switch.

martysmartie

iTrader: (1)

As I said in my original post, the newer fans will draw less power than the OE ones, so it's up to you really, but imo it's a very wise idea, you don't need one though if your doing it solely for the purpose of the override switch?

Even so you need to resolve the issue first.

Martin

Chopshop85

iTrader: (4)

yeah but I get the feeling the fans supplied with the (old style) airtec cooler were probably the cheapest fans they could get hold of.

I have one fan on the original loom and the other to a switch in the car. Both fans on the loom kept popping fuses, so this way I have one fan to run as normal and if it starts to get hot I have the other one on a manual switch. However, its getting to be a bit of a chore having to constantly check my temp gauge and flick this thing on and off.

Hence wanting to make up something where both fans just work as they should.

johnnysash

Yep, had the same problem on my series 1. Not popping fuses but did melt the fuse box slightly. I also have the air tec 'slim line Italian fans' they fit in the gap lovely but I have my doubts to the quality of Italian electronics!!!.... Anyways. Get some thickish cable 5 or 6 mm and run it from the battery to a relay. Run cable from relay to fans and run fans to earth on car. Use existing fan lives as the switch lines on the relay. Send me pics of relay and I can tell you pin numbers to plug what into if you want. You might also want an in line fuse to stop fires. Good luck

johnnysash

Also do a google search.....there are loads of guides that can help.

martysmartie

iTrader: (1)

What rating fuse have you used?

Martin

essexRSTSouthend

Yes you can martain,my car prove you can do it safely,a simpe 5amp upgrade will be fine but of course if your wiring shabby then don't do it. Replace with new wiring if you worried.

essexRSTSouthend

If you pop the new higher rating amp then something needs looking at urgently. Best of luck.

Chopshop85

iTrader: (4)

Got a new loom and MSD fan switch on its way. So hopefully all should work as I want.

Cheers for the replies.

martysmartie

iTrader: (1)

You certainly can upgrade the fuse, BUT it's NOT very wise to do so unless you are 100% competent with electrics.

The fact it's blowing, suggests something wrong, ok it may just need uprating due to the additional load of the additional fan, hence me asking what rating fuse it's got.

For example if the fuse is 30A and it's blowing this, clearly something is wrong, as the new fans can't draw more than this, and so by uprating the fuse you are asking for trouble!

Martin

Rogeyboy

iTrader: (2)

Im on the original loom with twin spal fans. But im going to wire a dedicated circuit for them controlled by my ecu with some thick gauge wire and a 25/30a fuse to ensure they r operating at full speed!