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Positive or negative

Want to charge 2 way radio direct from car cig lighter socket,on the plug, is the shaft positive or is the tip of the plug positive,to suit this type and model of radio. Thanks Tony.
tsuen shing-2way radio, MODEL wt-419

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  • greenrider Jan 08, 2008

    Thank-you people,you have made my life just that much easier,knowing I have you guy's to fall back on,great work,Tony aka Greenrider.

  • alan holmes Mar 02, 2008


    I have a set of T5522 radios with a drop in charger but have lost the mains lead. I have a universal charger but do not know what the correct polarity setting should be or the voltage to set it at. Can you help?


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It normally says on the case of the radio where the plug inserts. If not, get a DC Voltmeter and carefully read the voltage and observe the polarity of your test. Most radios have a positive tip polarity. Good Luck
NC Electronic
Mills, Wyoming

Posted on Jan 06, 2008

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Do you know where i can find the cig adapter for my 1802 m radio?

I am guessing that you should be able to run it off AC power using a car inverter that works off the cigarette lighter socket. Something like this.

Make sure you pick up the unit with the correct input battery and AC voltage rating for your radio. The operator manual is available from this site if you do not have one.
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I have a pair of sp10 and having trouble charging them and the batteries are new and when i put them in the charger i have to turn them on for the chargeing light to come on is this normal or are the...

You do not mention if you are using a wall plug charger, or a drop-in charger. We will give troubleshooting tips for both. To answer your question: If the light comes on and stays on, on the charger your charger is good. You have a radio or battery problem.

Wall Charger:
The light on the HTN8232 wall charger should come on and stay on when plugged into the radio, with the radio turned off. The fact the light comes on when the radio is turned on indicates your batteries are either no good, too low to charge, or you have a battery contact problem.
Solutions: 1) Clean your battery contacts with a pencil eraser.
2) Be certain the batteries are installed correctly.
3) Check your battery date code (three digit number on back of battery above the stop sign. First number is year, next two numbers are the week of the year. Batteries last about 2 years.)
4) Check to see your new batteries are NiCd batteries. The wall charger method is not compatible with NiMH batteries.
5) Try a charged battery from another radio and see if the charger light comes on and stays on with a different battery.

Drop-In Charger:
If you are using a drop-in charger, you would be using the above listed HTN8232 wall plug charger plugged into the tray. Here are some possible solutions for the drop-in charger:
1) Clean the exterior battery contacts with a pencil eraser.
2) Check to see if the wall charger will work when plugged directly into the radio.
3) If the charge capability of the radio seems compromised, take the battery out of the radio and charge it alone in the drop-in charger.

NOTE: Do not use the PTT if you are turn on the radio when plugged into the charger. This will burn out components in your radio.

The SP10 radio is known to be a repairable radio. (Generally around $69 flat rate.)

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Most devices that can be operated from external supplies have a diode across the the power jack that will short the source if the polarity is reversed.
Since this is a pretty small part without much chance of surviving the current available from a cigarette lighter socket, the only hope you have is that the fuse almost always found in these 'adaptors' will blow before the diode fails.

If the radios will not operate from batteries, I'm afraid they are badly damaged.

It son't hurt much now if you open the case and check near the power jack for burned parts. The diode(s) probably aren't there at all any more since they are commonly capable of no more than an amp or two and the typical fuse in those car adaptors is 5-10 amps, enough current to cause the diode to explode before the fuse blows.

I don't know where you reside, but in the US there are many sources for low-cost digital multimeters (<$20 US) that would have prevented your problem simply by checking the polarity of the jack before plugging it in.
I don't think the lighter was at fault; I believe the adaptor was wired for a particular item, just not for your radios.
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Yes I have fixed the problem thanks. If you like to know how you can join my premium plan costing just £12.99 a quarter.............


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A possible solution is to check the bottom battery's positive terminal and ensure that it only contacts with the positive terminal of the battery and does not touch the battery body (which is negative).

Alternately (and perhaps more to your advantage), seek replacement of the defective unit considering it is new and therefore should be under warranty.

Hope that this be of some help/idea. Pls post back how things turned out or should you need additional information.

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