940 blowing fuse 1 and not starting

[aardvarkash10]

Originally Posted by coolpurks

Is white ground on that bulb holder? Cheers!

Earth is rhs looking into the connector, lhs looking into the bulb regardless of the colour of the wires

[Laird Scooby]

Originally Posted by coolpurks

Thank you I will make the tester try and disconnect everything listed in post 16 connect to fuse 1 and then if the bulb doesn’t glow connect 1 at a time...

Is white ground on that bulb holder? Cheers!

No, make and test the tester and fit it in place where fuse #1 would be and switch the igntion on. DO NOT DISCONNECT ANYTHING YET!!!!!

Watch the bulb as you do it. If it comes on as soon as you turn to KP2, let us know.

If it takes a couple of seconds before lighting, let us know that as well - don't do anything else!

As for white being ground, none of them are - at the moment, it's just a bulb connector.

Green is the common connection, blue opposite it and also vertical is the dipped beam filament. White is going to the horizontal terminal and is the full beam terminal.

About the use of the headlamp socket in a system

On a positive switched system (like your Volvo) the green will be connected to earth or 0V.
On a negative switched system, like many Japanese cars the green will be the +12V feed and then the other terminals will be switched to negative or earth - earth switched system.

[aardvarkash10]

^pretty late at night for an old guy isn't it Dave?

Beautiful autumn day here in Isolation City, NZ. Commenting here between building a new stairwell and drinking coffee.

OK, mainly drinking coffee.

[Laird Scooby]

Originally Posted by aardvarkash10

^pretty late at night for an old guy isn't it Dave?

Beautiful autumn day here in Isolation City, NZ. Commenting here between building a new stairwell and drinking coffee.

OK, mainly drinking coffee.

My sleep pattern has been thrown to Helen Back this year Ash, i'm awake (and alternatively asleep) at all kinds of weird and wonderful hours lately.

Been an awesome (23C) spring day here, been getting on doing a few bits of hardwiring for my dashcam in my other beast, hiding the rear camera cables above the headlining etc. Time consuming because the headlining doesn't just drop after removing trim like it does on the Volvo and the channels in the roof where i can run the cables are pretty narrow so it's been fiddly to say the least..

Also many coffee breaks were necessary, at least two buckets of caffeine each time as well.

[coolpurks]

Thanks all, I have ordered the bulb holder, annoying that you can’t just pop to the shop! I will make up the bulb tester as soon as it comes, plug it in and let you know whether it takes a second or two, or not. Realistically, it will probably be Monday Or Tuesday when that comes, so I will be in touch. Thanks again, James

[Laird Scooby]

Originally Posted by coolpurks

Thanks all, I have ordered the bulb holder, annoying that you can’t just pop to the shop! I will make up the bulb tester as soon as it comes, plug it in and let you know whether it takes a second or two, or not. Realistically, it will probably be Monday Or Tuesday when that comes, so I will be in touch. Thanks again, James

More realistically James it'll be tuesday or wednesday - monday is a bank holiday! It might not even be despatched until tuesday in which case you might get it this time next week.

In fairness it's not the sort of thing you'd normally find on the shelves of the average carparts shop so you'd have to order it anyway. Do you have a spare H4 bulb to fit in it that works?

[coolpurks]

Yes I have a spare bulb although not tungsten the only one I could see on eBay was a 100w one! So I’ll put it all together and let you know when I’ve done it. Have a nice Easter weekend all! Cheers!

[Laird Scooby]

Originally Posted by coolpurks

Yes I have a spare bulb although not tungsten the only one I could see on eBay was a 100w one! So I’ll put it all together and let you know when I’ve done it. Have a nice Easter weekend all! Cheers!

Just use one filament in it then, not both as Ash suggested for the tungsten one. It will still restrict the current to about 8A so shouldn't increase the damage.

[aardvarkash10]

also, if you can fashion a heat shield of some sort that would be good. A halogen bulb creates a LOT of heat and will happily melt its way into any plastic, carpet, seat cover, finger...

[coolpurks]

Originally Posted by aardvarkash10

also, if you can fashion a heat shield of some sort that would be good. A halogen bulb creates a LOT of heat and will happily melt its way into any plastic, carpet, seat cover, finger...

Haha ok will do! Thanks