leon Posted May 10, 2006 Share Posted May 10, 2006 God knows why anyone would put such a small battery in his car. The previous owner of the car i bought put a 250 cold cranking amp with 11 min RC time (reserve). it is half the size of the batterys you buy in the shop nowadays. Anyways, itss dead now (sigh of relief :banana: ) i thought i might as well do a relocation in the boot. Plus my cables seem to be more corrosion than copper. Has anyone done this? im just after ideas? someone told me i just have to run (preferably) a nice fat positive wire to the engine bay and ground the negative somewhere in the boot. Also i need a good idea to stop the battery from making my boot into a horror movie. p.s. there is no max size for a battery right? Quote Link to comment Share on other sites More sharing options...
Gl-boost Posted May 10, 2006 Share Posted May 10, 2006 On my 86 BMW 325es , my battery was in the trunk. I find it like this in alot of BMW cars but some had them under trhe hood also. The battery cabble was routed through on the side of the rear fender well on the passengers side, I think it then went into the floor and was in the inside of the car along the rocker panel area and then went into the engine compart ment. That would be a rather large piece of cable, and my BMW had a large fuseable link. It was about half a foot from the battery in the cable itself. So it was cable then fuseable link then the rest of the cable, if you get what I mean. So if you could find a older BMW and get the cable out, it should work. I think it will be long enough. I think all 325,e,i,es,is cars have trunk mounted batteries, and that the 318 models had them up front under the hood. Hope this helped any. Quote Link to comment Share on other sites More sharing options...
bgd73 Posted May 10, 2006 Share Posted May 10, 2006 Going extreme on your battery to counter-act another is not necessary. I bought a 425 cca battery in 2000 and it is now 6 years later, in its second soob, and 5 winters reaching killer temps below zero. Never had a jump start. Have given plenty of jump starts however... Bolting it down with the plastic tray underneath and rubber cover over positive terminal once installed seems to be only importance not to forget . That corrosion should go away with enough amperage, and no short circuits. Quote Link to comment Share on other sites More sharing options...
subyrally Posted May 10, 2006 Share Posted May 10, 2006 i moved may battery to the trunk. i ran a 2 gauge cable from the posi cable under the hood and grounded the black cable to the strut tower. i ran the cable between the fender and strut tower under the hood. if you look, there is a nice litle tunnel next to the strut where i think the hood latch cable runs, i wouldnt know, i dont have a hood release cable. i still need to hide the cable somewhere in the car though, right now the new battery cable is just running down from behind the dash, along the driverside door sills on the floor, and through the back seats to the battery. the battery is in a box in the rear storage thingy at the bottom of the trunk.then from there, i just ran the neg cable to on of the large rear bumper bolts. it works very well. Quote Link to comment Share on other sites More sharing options...
Matty B Posted May 11, 2006 Share Posted May 11, 2006 My battery is now behind the co-pilots seat. It seems Mr Fuji left enough room for my blower right where the battery used to sit. Ran a big fat welding wire through for the Positive and grounded the Negs. Quote Link to comment Share on other sites More sharing options...
NorthWet Posted May 11, 2006 Share Posted May 11, 2006 My $.02: Run dedicated wires for BOTH positive and negative terminals. Sure, you can ground the negative and get away with it for awhile. But running up to 500 amps through the body means running 500 amps through every weld seam, and electrolytic corrosion will take its toll. FHI runs dedicated cables to the starter for a reason... and those still have issues that require cleaning/maintenance. Quote Link to comment Share on other sites More sharing options...
SOOBOUTLAW Posted May 13, 2006 Share Posted May 13, 2006 My Optima redtop sits on it's side where the spare tire used to be on the firewall. Quote Link to comment Share on other sites More sharing options...
Hank Roberts Posted May 16, 2006 Share Posted May 16, 2006 I'd been wondering about that placement, to add a second battery (do a lot of backcountry car camping, native plant botany restoration in the summers). So heat's no problem? Guess not! Quote Link to comment Share on other sites More sharing options...
subestyle18 Posted May 17, 2006 Share Posted May 17, 2006 I ran a group 34 blue top optima where the spare when 900 cca's and 75 amp hours, and also a redtop, 1100cca's and 55 amp hours, in the stock location. I figure (IN THEORY) i could crank the starter for an hour before the batter dies. Quote Link to comment Share on other sites More sharing options...
dpoppeli Posted May 18, 2006 Share Posted May 18, 2006 BMW trunk batteries... http://e30m3performance.com/installs/installs-2/sm_batt/sm_batt.htm Quote Link to comment Share on other sites More sharing options...
djkindt Posted May 18, 2006 Share Posted May 18, 2006 My '91 318is had a trunk mount battery. Probably because it was the "is" model. I think all 325,e,i,es,is cars have trunk mounted batteries, and that the 318 models had them up front under the hood. Quote Link to comment Share on other sites More sharing options...
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