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Old 09-19-2010, 04:30 PM
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Bighead Bighead is offline
Trail Ready
Join Date: Jul 2006
Location: Woodland Park, CO
Posts: 318

Originally Posted by nakman View Post
is it really the battery? Pretty common to hear a hissing from the charcoal canister.. which is near the battery obviously.
In the 4Runner it could be the brake accumulator but that is more of a buzzing sound and is closer to the back of the engine bay. I put my ear fairly close to the battery and the sound appeared to be coming from that positive-side vent.

Originally Posted by AShoe View Post
Does it stink? Check the voltage across the battery while the truck is running. Venting gas can be a sign of overcharging. A strong sulfur smell is a sure sign of overcharging.
Didn't notice a smell and didn't notice anything visually (any kind of colored smoke). I don't have a voltage meter because I am an electrical idiot .

Worst case, if the battery is indeed overcharging, is it safe to hook the battery back up and run it to check the voltage? Am I correct in assuming that an overcharged battery will mean I need to plan on a new primary battery this week.
2004 Land Cruiser -- OME/Slee Suspension | F/R ARB Lockers | 285/75-16 Nitto Terra Grappler | Slee Armor front, rear, sides and belly | Dual Battery | ARB Drawers
2015 4Runner Trail Edition Premium - Stock
2014 BMW R1200GS Adventure
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