Hooked up the battery backwards by accident. The Tach is now froze on 4000rpm's now and it no longer works. Any ideas as to what is wrong?

 

Check your fuses. You might have attempted to short out your system.

 

Did you give it a "technical tap" yet? If not you should give that a try. If the "technical tap" doesn't work get a bigger hammer and give it a "love tap". Repeat until fixed or in pieces.

 

Now that is funny,[img]i/expressions/face-icon-small-happy.gif[/img]

 

After the "technical tap" failed i decided to perform open tach surgery. I utilized my dremel tool and a big *** screwdriver. I pried the damn thing apart and cannot find anything wrong. Anyone have any ideas as to what could have went bad? The fuses are all good.

 

when i shut mine off, it will slowly climb to about 4000 rpms.as soonas i turn the key back on it goes down

 

dsjobber. I think I know what happened. I burnt my tach up 1 time from having a battery charger on crank boost, and it over voltaged it. There is a voltage resitser in there that blows too keep from burning up the tach. The problem for you will be finding it. The part to fix only cost like .25cents. I fixed mine after countless times of contacting and shipping my tach to the actual manufacturer of the tach wich is autometer. If you can trace electronics you should find this. I found an online store that sells electronics and that would sell to the public and sell the amount you want. I bought 3 resisters and paid alot more for the shipping than what the parts cost but I fixed it for like $8.00. If you want help, pm me and I will help. The only way that, that tach will work again is to replace that resister. Let me know. RUSS

 

DSJOBBER,

Do you have a # for AutoMeter. My friends needs one fixed.

Thanks,

-Moose

 

I hooked up my battery backwards once, luckily it didn't hurt anything. I have taken my tach apart to straighten out the aluminum bezel after a wreck. If you take a small screwdriver and go around prying the bezel from behind, it will eventually come out. When putting the bezel back on, you can run a socket or other smooth piece of metal to get the aluminum to bend back around the rear lip. A dab of silicone wouldn't be a bad idea to keep out moisture.