Pleeeeeeeease help!!!!!!!!!!!!!!

I have used a Vikki Green Loom and as far as i can tell i have made all the right connections. The only addition i have made is a power supply for the electronic ignition and a take off for the cooling fan. both these were taken from the ignition system.

I have taken the helpful advice of you all before and used a battery charger for the first power up its an 11amp supply.

The problem is that as soon as I apply power the 15amp fuse (which according to the loom diagramme is non Ingition power supplies) just vaporises in a blue flash. With my heart in my mouth I turned the ignition key and all appears to be ok warning lights starter etc. (only exception is some of the guages have no lights but they move showing some power)

I have checked the earth leads with a meter and they would indicate that they all have a good connection, so a dead earth is not likley.

what should I look for ???

I dont want a moving bonfire

Could it be the feed you've taken for the cooling fan?

If you have fed the fan motor directly from the loom it will be drawing too much current.

I took a feed (green wire) from the VG loom and used it with a switch + relay to power the cooling fan with direct feed (30A fused) from the battery.

Can you test each circuit/component individually to see where the problem is?

Nick

Sounds like something in that circuit is going to earth that shouldn't be!


Cheers

Mark

Thanks lads

I will remove the fan connection and retest as a first step. if i am reading it right, according to the loom diagramme the purple leads and leads with purple stripes power things like the horns and some lights etc. these i will check next.

i will get back to you soon. (when i started the car i had just got rid of the wife, now i have a new girl friend and my car is 20miles away. back there on tuesday and my son will help)

thanks again keep up the good work.

If it's the circuit for the fan then a 15A fuse is more than adequate (I run a fan and the hazards through a 15A fuse). I do use a relay, but that's only to ease the load on the switches.

I suggest that you take all the loads off the circuit that's blowing, and see what happens. If it still blows, then the wiring is wrong. If it doesn't blow, then connect items one by one until it happens.

However, a less destructive method is to use a test meter - fairly cheap in most motor factors. Disconnect the battery, one lead on the chassis and the other on the fuse connector. Set the meter to resistance or 'continuity' and it'll tell you if you have a short ('continuity' usually gives a bleep if there's a short).

David

[Edited on 12/6/05 by David Jenkins]

Sounds like a dead short to me,as David says diss each component on that circuit and reconnect each one till you find the fault put a smaller fuse in so you dont do lasting damage.
A multimeter and a half hour to familiarise yourself with it is an essential bit of kit in my view.
Cheers,
Bob

it can beeb..

but if the resistance is lower then appr 180ohms depening on meter

it already beebs while in fact you can be measureing an primery relais side etc.

if i was you i would put it always in resistance...

and measure it without any thing connected..

60Watt bulbs on 12volt have 60/12 = x

12/x = ohms soow thats not much..

soow measure resistance...

if iw as you i would do the take off all takers....and try if it still blows...

should be easy to find..

Tks

Sounds like the fan circuit to me shorting out somewhere.

Rich.

Ahhh... If its the Fan Circuit, it should be Fused anyway.

The switch may not handle the current, if not use the switch to pull in a Relay, and use the Relay contacts to switch the Fans.

My Fans (I have two Polo Fans in parallel) will blow a 15A fuse, but do NOT draw 15A when up and running.

The Start up current at Switch-on is 20+ Amps, and will blow the 15A fuse.
If I short the 15 A Fuse, and let the fans run up and then remove the short (Across the Fuse to stop it blowing), it runs happily with a 15A fuse.

The Rush Current on Fans can be quite large, but its only there for less than a second, however, its enough to zap the fuse.

I would HOLD the wires acrtoss the battery, and see if the fans run up OK, and run without producing any more flashes and smoke!, (Hold the wires so you can disconnect in an instant!)

If they run OK, I would then put an Ammeter in line and try to read the rush current, and the running current, and then sort an appropiate fuse.

This is also a good way to check if you have thick enough wire feeding your Fans.

You can do most of the above on the bench, or just take a couple lengths of wire from the Fans to the battery for the test.
You could also have a wiring fault, ie a wire that has been pulled tight across some sharp metal and cut the insulation. Probably not, but check this by fitting a small fuse, and Disconnecting the fan. If the fuse blows, you could have a wiring fault or a problem. If its OK, then I would check the current drawn by the fans at startup (Starting up of the FANS) and the current when they are spinning at normal speed.

Just my 2d worth.

Disconnect and remove the power supply, then connect a multi meter, or 9v torch battery and 9v bulb in series with the battery leads. This will show any shorts. You can then disconnect leads etc. quite safely until the short is found.
Cheers J&J

quick heads up....
DMM in ALDI on special offer for £6 till thursday - does up to 20A AC as well as all the normal ranges.
This is a reasonable bit of kit - for all those jobs round the car and house.
Bob C

Neat little hand held one in Maplins too.
About £8 reduced from abour £25.
Cheers John

I saw the one in maplins, but i had already bought one from car builder solutions for £7.50 ish.

I will be at home tonight checking up on the fan connections and talk the dash off the skuttle and check all connections.

will let you know the out come.

regards Ditch

Many thanks lads,

half hour with the wiring diagramme, and i had located all the systems needing testing.

2 mins in the garageand i found a cable that had not been connected to Earth. Problem solved.

Silly me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

let that be a lesson to all you wiring novices, check, check again and then switch on.

Many thanks
Ditch