smoke/pow/eek/always use a fuse!!--need help w/ switch!?

appreciate the advice! so the consensus so far is i probably mixed up the polarity when i connected the amp to the batteries. certainly possible, though i thought i was careful re that.

I LIKE MUSIC, do you have a link for that 1st switch? i used zip cord from an old extension cord for my wiring; is that sufficient?

The gauge of your wire needs to be, at a minimum, commensurate with the fuse protection in the circuit.

I suggest a main fuse first thing right at the battery to protect the entire power circuit from meltdown if there is a downstream short. Just be sure the wire gauge is large enough so the fuse blows before the wires get hot.
 
i will generally fit a reverse polarity diode and a fuse so damage can only be caused to the fuse and sometimes the diode if unlucky .. diode goes right across power supply fuse goes between battery and diode .
another way if you can be bothered and have correct supply is use a bridge rectifier then it doesn't matter which way you connect the battery . i learnt that from a Philips radio back in the the late 1970.s . it was fitted as standard .
 
The bridge rectifier works pretty foolproof if the circuit will tolerate the added voltage drop across the diodes.

That said, a little color coding and a fuse goes a long way.
 
reverse polarity diode is a must have in combination with a fuse .. otherwise fuse will blow after damage is done ...
just for example ...http://data:image/png;base64,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
caramppowercircuit1.png

http://data:image/png;base64,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
 
reverse polarity diode is a must have in combination with a fuse .. otherwise fuse will blow after damage is done ...
just for example ...http://data:image/png;base64,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
caramppowercircuit1.png

http://data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAASgAAACqCAMAAAAp1iJMAAABCFBMVEX///8lQGF5nstwmMhslceFpc8AAAD/AAC2yeJIfrzx9frf5Os/ZZH39/cLMlf4+Pjl6OweO103YJJFW3fq6urKysrd3d1gYGDw8PDQ0NBaWlrh4eGzusSoqKhlZWV1dXVPT085OTl7e3vBwcG0tLSXl5eQkJBAQECurq4nJyeIiIhrhKUxMTFubm6dnZ15eXkdHR0TExO5xdRISEj/7e3/np7/2tr/PT3/ZmZSfrSirLkrRmZAU2rP1+J0g5coVYeGlKSYqL+ElrBVaIFZdZYAKlM7Zpn/urr/f3//ior/JiX/TEz/OTmjiKr/rKyjs8iFnb1zi7n/yMj/3d2Se6T/dHT/WVn/Ghov+97AAAAJjUlEQVR4nO2dj3+TSBbAX0+P3mopbRxgACH8JqEhTUXrqldT67rurnfXPfdc////5N5Mfm6N7aRpGqzv+9E0JMx0+OY9ZoAwBSAIgiCIa2Hom25BQ2FZaYmffW+0WFRkaiH9JNHQUTIo5aLf33B7mkyYAFRmZOBTLwwSIwNILXCqzAB2GFubbl5zwIjiBdgmPjXaJeMaekvgiFu6HnleyDfdvqZQYtIlGSRtsZD7MBalYZylgWfVzqYb2BD8AB/c0Ha7InTyvhTVTsAoI5a6aSeliJKkgW6AV+u60U5xseyDoRl6YYIOcWqFmI2bbmEzMMLQDf1U9HWmyL1+B/8X7cDhblxxyNzDNg0XJAbn3BhFjTQinnLxoDOxyBlFFEEQBEEQBDHi46fnzz+9X67Mm52reLOexm4O/cdtyZ9Plyl1cP7wUvbOD9bV4E0x9rS9/XyZUgdPrljhycqi9k72rl/Y+LjU567A++0pz5Yotn5Rb1rD1vXT93j784dfP97E4WZ/fGz/YSZqmZBau6jzYavVGp5ft/jxaJM+PDteVVYxPq22Pcd/76ty78VVa7x4cU+5tkXstCTXreR/s63689kKrsyk10mMi6J+/7syL+5dscL9F+qVLWIkaue6xf89t1n/WmF31cm6ZV+K+m1W4W9LVHBwcsUKq6bemUy9a1cyTr3tD7+8/2O1hkxS79eZqE9LFF/7PurBzrA13Ll2v/dRfPCf3t9A11eORT2diVqm1vX3evrvP58/uHbpp7/8Z8VI+oJJkG5/XKbULYyj/vHD9T2thT8+fd7e/vzj8VKFzlpXHMG0zlZtV+NEYZweHy+bzA8uP4JBVt7KBopqJiRKERKlCIlShEQpQqIUIVGKkChFSJQiJEoREqUIiVKERClCohQhUYqQKEVIlCIkShESpcj3LerC1/Qv+9b+XRRltXGD+30Ajv+rduXja6zyAPx2zEEv48lVRAgcPZwr6F5yB9YdFJVWmo4brVnAQuBHjinunj0cmOBXeseFtm9k7fGqgQPzNzxeEMX3ZrDzHx7OLa7wXanmwKArRPmuFNWTryV524TaAqOrBwl05P20aZGjmQqgE4YmLtZl6IAXuOmkote7+1O2kP057oQpKSrkoclD0DU7wKCpjcqELoZWxJhbidQEq8dNzQFN3MHGNG5F3NEco2azuJoXtX93RTGvx1xxr1UygH4KU1GW2ynE7bR+JlPvCAJcipNOLlLPqdPU7YyrOX00B4qaX7wbt0mOREE7s+VixHpx3HO9AkOrxyMO3gDmRTlClD8SFTqOs0jCye7W7lXfLfrW4N7A4lB7wI5q8DyeFIbBDdw15TlPA+g6YBa4mlNzpytSzz/kXo87IbOOHF544C24BdJ4tb+1/+puhNEU37ZtH0oGYqftBO6h7NgyC/TYbTN8pd0ezSXh5r6FO3Mjd21HLJa4aAZiCPEFp7uYerunt7od3yKW7PXuXvLdOG9HovbfbrohDefl7taI3Zebbkqj2Xu1Pxa19epujJ/WxOtJQGHyvd50YxrMk5knTL6rvi36HTNLPBFSj2gCha9wOh9QNJj6Kif7W3/l3cNNN6mZvL0o6tLBVGW79uw8TVue90pDDlmAx5H4lh3gsD8J7QqPDbwqxMPMwLbvxOxpj3e3LnLZYIozO2XTY8VanK8AV2OmrTMLmNNjYqYYP+ZpAXov4VZqRIzJkxnfOHuvLgYUhtSlg6kKDxvLupBRVXcOxeRfXWaG8j0WyR/iREVX78hw0/H43L4Dol5/GVBXDKYqE/ol8K4InUIf6ODyAYN4IMxNRJWYjhDL015Gt6zCtW/G2jlZ5OnywRSKEqdIqwSfF0buWxUcoTSrjqeiOloR87EoMf1euxyXNUzz8gnmWGIumgbLqKZjFmsj0Wk8+jLxRoOpr8/ahaLESRuZToXuhWUiRQFof0k91CXmmpOpx7RxWUsrbfuS9niRH6cLXjd60/Y4nQXvQ77mwd/p4oC6dDAVmOAHXlKLpkUcatwGjaWp1UcDbHSlw5cRZHT7TppB13GqfFzWwnUKBywfbWDoeNg1ou/Exy7BsdJJQYcDN4F5ZgefWJZ4N9IxgHXx2XAL3+/gksWSVMf+A8uD00u9dXp6uDieZEx9dTAl2t2pShlEmQ4mbl/GWVmJD5VnchUzkT9YXmUM8jhOJmWFqJ5nhmnuQpBAHIBjQztPagZdG0PFOhLxhMHqhJAM8qwHVjfu4C4wwmKQYM8hJo0MXL9OoR/1YxsSrFHTk15/rXNGvn23O2N/f25h992jdfxCa5C7pczcyEpLiELIE+OI61kGPXna1Qu7lohZx4UE93mh47lyhshIpLMrztuasShvtiHzAQZ6gvl9pEO43gn+njye4+znl/OLj9fxC63CxI11MSZth4dOXjo2Z1qelyZE471MGk1ElWJ/6AXymnhksEJccpoXlYorKSNRxm3O1nobl9Qtua2YdICjC7tykqoC40i8ZkhRoveMxOSiKYpCBV3Pw30hdrCRDlUlB/jJVFQOfCCMck036rsmKhSPTm3XuENKNZ1rmD/9MA88oydEdUK7TsDsBhWK6gV1if1g4LqGEJVo8ooJisLRiVlhsaDoY6fqHmo6xMWiznI93MqXNEa7Et2TAcDlP4wjb/IMuLyUxpm4rFuKiTOtQPdGq44ki3ncdfmYpVx0KIYnK110CW5NNO3bLGJnPklWQXxhAJUtHFDdAk0TpY/mZZ3ufNiF9/mmZrJtmqjGQqIUIVGKkChFSJQiJEoREqUIiVKERClCohQhUYqQKEVIlCIkShESpQiJUoREKUKiFCFRipAoRUiUIiRKERKlCIlShEQpQqIUIVGKkChFSJQiJEoREqUIiVKERClCohQhUYqQKEVIlCIkShESpQiJUoREKUKiFCFRipAoRUiUIiRKERKlCIlShEQpQqIUIVGKkChFSJQiTRRlpEHh+g2bPLyBopwjTXJ7s2So0DxRljahUaZWFnXjk4K5U1GDBmXfyUHrbKVp360iTi7OdrESs4BqUkidDIet4XAVU4nYoKK8OVmdOVH//FtT2GkJdlao4afJRkVxciNZ6M+LutcQ7o9EtVao4qe57XKv1rCYKmpPnydzFTZnEt2DIWoaHqxQw2S7unbfuZGI4oOZKOvq1W+JhzvD4XBnlXmn05uUJMmmnoIbq3N19t6cvVnp7y14VX/hnzBagWCy12vQ6KCZ+HJonm9qSq1vCce8wVwmCIIgCIIgCIIgCIIgviv+D3oV+nyUJ9FSAAAAAElFTkSuQmCC


That's fine, if the consideration is connecting the battery backward at the left side of the illustration. It doesn't help if you connect backward to the amplifier at the right side, which is what I understand was the problem in this csse.
 
OK, good news: the new board and switch arrived. wired it up with a 10amp/250volt fuse. works! sounds great too:beerchug:

update: didn't see last 2 posts before my report (above); will look into diode
 
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