Question about Sirius Boombox for Select Satellite Radio Receivers

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No sound Model SP-B1a This unit was hooked to a 12V battery but the polarity was reversed. Everything works but there is no sound at all from the boom box. I've opened it up and have the circuit board out hoping to find a blown/burnt diode but everything looks fine. Any clues?

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  • redflag600 Aug 24, 2008

    Sorry, I should have said this is a Sirrius boombox I'm reffering to.



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The polarity was reversed and semiconductors are burnt at the output of the unit.

Posted on Mar 20, 2009

  • bernard lunda
    bernard lunda Mar 20, 2009

    the polarity was reversed and semiconductors are burnt at the output of the unit.



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I believe this got hooked up in reverse polarity. It will not work know. Can it be repaired?

Hello Mike,
I believe... the big danger with hooking up batteries in reverse polarity... is the explosive RISK.

It seems you got away with that...

(although it is a VERY good idea to have fresh water & baking soda IMMEDIATELY NEARBY if you do manage to provoke an explosion. Once you are blinded, perforated by battery shrapnel, burned & soaked in ACID you won't be thinking clearly).

Most everything in your car is rated for 12 volts... the POLARITY is only important for magnetic direction... Such as windows going up instead of down... seats going forward when switched to go back... Lights don't care... Diodes and transistors simply won't respond...

With the possible exception of some rather unique POLAR capacitors ... but we know that is really not all that wise... No/yes?

Perhaps now would be time to analyze what the ORIGINAL problem was when the battery got removed, reversed... Make, year, Model... and operational issues... and history...

Just put the battery in correctly (Battery & Ground) ... and start with the BASICS.

FUEL, FIRE & AIR... I would be happy to make more relevant suggestions as you progress... Just comment me back.

Stay safe... work safer...!!

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Here is the way to hook them up in series, or in parallel.
There are 3 batteries in top (series) pic, but a 4th would be added in same wiring manner. Disregard the letters "ve" in diagrams, but the +/- polarity is vitally important in hookup.
Note that four 12v batteries hooked up in series will be 48 volts at the end terminals. (If all four are hooked up in "parallel" then the total would still be 12 volts).

If you want to supply a 12v inverter, you need to hook 12v batteries in PARALLEL.


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Hi Anonymous, drain battery completly buy hooking it up a headlight. It may take a few days but it is the only way, make sure battery has 0.0000 volts before hooking it back up to a trickle or 1 amp charge rate. Good luck

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I have an Onan 3600 microquiet lp. I made the mistake of hooking up a jumper box to the battery with the cables crossed,now it blows the 5amp fuse that supplies power for starting. hope I didn't fry...

It certainly sounds like you have damaged the control board. If you cranked it with reverse polarity, there is a good chance that you have rotor winding damage also. If not you still may have to flash the rotor windings to ensure a correct polarized field. That involves hooking a battery for a couple of seconds to the rotor brushes (with correct polarity) with rotor brush wires disconnected. Only do this if there is no output voltage after you replace the control boards. Bad mistake :)

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reversed polarity,check fuses. check the system for burnt wires also !
Always hook up your battery terminals correctly, as the alternator may be damaged if the battery is hooked up backward. jump start car, if it will. there should be at least 13.7 to 14.2 volts at battery posts while its running. if alternator is ok.

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1 Answer

I have an Icom VHF that was hooked up reverse polarity on 12v.

They likely replaced just about every diode and possibly the main circuit board. The tech should be willing to tell you exactly what work was done, and many return the replaced parts.

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Take a positive lead from your head unit and wire it to the negative of your sub. Now ground the positive terminal of your sub to the vehicles chassy using a wire. This creates a 12v-14v reversed polarity current that should be strong enough to (POP) the cone so to speak. hope this helps

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