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Author Topic: Horn push earthing - problem...  (Read 314 times)
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peteracs
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« on: October 29, 2020, 05:28:46 PM »

Hi All

Ongoing testing of electrics and come across a problem with the horn. The +ve side at the steering wheel is just fine, the problem is that the centre of the main steering column fixing the steering wheel has a variable resistance to earth and never gets anywhere near to a dead short, so anyone know where it should short to earth?

Peter
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Beta Spyder S2 pre F/L 1600
Saab 9-3 1.9Tid Cabrio
peteracs
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« Reply #1 on: October 29, 2020, 06:13:23 PM »

Hi

I should have searched for an answer to this first.... sorry to waste your time.

This thread explains well what to look for.

https://www.betaboyz.myzen.co.uk/forum/index.php?topic=3497.0

Peter
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Beta Spyder S2 pre F/L 1600
Saab 9-3 1.9Tid Cabrio
WestonE
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« Reply #2 on: October 29, 2020, 06:18:41 PM »

Sounds like time for big self tapping screw into the mount for the pedal box/ steering column connected to the earth wire for the column stalks. Remember painted things bolted to painted things do not conduct. In fact plated things bolted to painted things do not provide an earth return. Non PS Beta's usually have an earth tag on the rack shock absorber this is intended to provide an earth return through the column which is an interesting idea given paint and grease along the way.

I hope this is of some help.

Eric  
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peteracs
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« Reply #3 on: October 29, 2020, 06:59:52 PM »

Hi Eric

I am going to investigate further tomorrow, as you say hard to know which internal part of the steering column has a good connection to the external world.

Thanks for the suggestion

Peter
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Beta Spyder S2 pre F/L 1600
Saab 9-3 1.9Tid Cabrio
peteracs
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« Reply #4 on: October 31, 2020, 02:11:54 PM »

Hi

I installed an earth on the tab of the steering damper and although that sorted the main rack earth, only did a little for the actual inner part of the column, also the three parts of the column in the cabin give differing results (meaning the connection between them is also poor), so am going to have a go at introducing an earthing connection near the steering wheel. Maybe a complete waste of time, but worth a go in my view given the flakey connection I have so far and the switch bank being so close with a really good earth is so tempting...

Peter
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Beta Spyder S2 pre F/L 1600
Saab 9-3 1.9Tid Cabrio
WestonE
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« Reply #5 on: November 01, 2020, 09:45:05 AM »

Hi Peter

I think your strategy is sound. Those column switches burn out for several reasons and high resistance (poor Earth) is part of the story.

Eric
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peteracs
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« Reply #6 on: December 06, 2020, 01:05:12 PM »

I managed to get a decent earth by adding a strip of 1/2 wide copper, suitably bent to allow it to rub on the boss of the steering wheel and secured on the fastening screw of the switch assembly. These copper strips are widely available and used in modelling I understand, mine was sourced via Ebay. I used copper as that will wear and not the boss, also it is simple to shape due to being very malleable. Sorry no photo at present will do when I remove the steering wheel again.

Peter
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Beta Spyder S2 pre F/L 1600
Saab 9-3 1.9Tid Cabrio
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