DC Plug replacement

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  #1  
Old 02-06-15, 04:12 AM
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DC Plug replacement

Hi

I have a project that I would be grateful for some help with.

I own a ski jacket that has a built in DC electrical circuit that heats the jacket. Power supply is from lithium ion batteries (7.2v DC) that plug into the circuit by means of DC power plugs.

Unfortunately one of the plugs is playing up and need to be replaced. I have sourced a replacement and propose to solder it to the wires having removed the existing faulty one.

The jacket is machine washable and therefore I need to make my new plug and the join as waterproof as possible.

Could anyone provide any advice on the best way to achieve this. I was thinking of going down the liquid electrical tape route.

Any advice would be gratefully received.

Kind regards

Griggs
 
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Old 02-06-15, 05:44 AM
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Looks like a good method to me, never used it before but the spec's good.
Geo
 
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Old 02-06-15, 08:03 AM
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Many thanks for your reply. Sounds as though I am on the right road !

One other quick question, what is the easiest way to tell if the centre pin on the battery socket is positive or negative? I need to ensure that I solder the correct wire to the correct contact on the new plug to ensure continuity of circuit.

Many thanks

Griggs
 
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Old 02-06-15, 08:44 AM
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If this is a purely resistive circuit polarity doesn't mater. To see if a battery's center pin is positive measure the voltage with a multimeter. If you have the positive probe on the negative of the battery an analog meter needle will go backwards. A digital meter will show an indication of incorrect polarity such as a dash before the voltage reading.
 
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