Usually, if your negative battery cable is getting hot while the engine is running or shortly after turning off the engine then there is something causing resistance in the cable that is creating heat. It takes like 20 minutes. Some people first hear a hissing noise, while others see what appears to be smoke coming of their battery, while others may notice a foul odor that smells of rotten eggs coming from the battery. Thus, ground clean and tight connections along with many grounding points from the negative post are highly important for good current flow (and why you disconnect the negative from the battery when working on your vehicle when the potiental current is not needed) and why it's highly important In most situations, a battery is being overcharged to the point that the battery begins venting the excess pressure created by the overcharging scenario. Smoking jumper cables without cranking the engine points to a major short to ground of one of the wires connected to the battery distribution point on the starter solenoid. A poor connection at the Battery Terminal, or at the other end (at either the External Solenoid or fastened Directly to the Starter) can do it. First, make sure your fire extinguisher (s) are charged up. Could this be as simple as the starter shorting or the alt being bad or a solenoid or what? I quickly disconnected the negative and did some troubleshooting. Which I guess is coming from the camper charger? With battery cables that old, they could easily be messed up somewhere under the insulation. I did get it started after a minute, and the smoking stopped. Move the big ground cable to the engine block, be sure to scrape the paint off the block to be sure to get a good connection. I did get it started after a minute, and the smoking stopped. It is probably a short on your positive battery terminal causing it to ground out, which virtually gives you two negatives. I would recommend pulling off your positive cable all the way from the starter and the fuse box and inspect it to make sure there are no cracks, splits or melted/bare spots. Next, get a new negative battery cable - that one has damaged the insulation if not the cable. Seems a mystery why the wires were overheating.. Maybe something to do with the bad battery. From today's featured article The Cleveland Centennial half dollar is a commemorative United States half dollar, dated 1936, issued to mark the 100th anniversary of Cleveland, Ohio, as an incorporated city, and in commemoration of the Great Lakes Exposition, held in Cleveland that year. I think I am going to get rid of the alarm system for a start, I reckon its part of the problem.. If there is no way to see what is on the battery (the terminals cover them), follow the cables back to their source. Step 4. The biggest reason a battery terminate or connection would get hot is the connection is lose. Seems a mystery why the wires were overheating.. Maybe something to do with the bad battery. battery cable since the other was a mess. Resistance causes heat. #2. Finally touch one probe to the red battery cable and the other probe to an unpainted metal part of the car. I put on a new neg. Most have the equipment to make cables there at the store, I usually ask for 2/0 (two aught) with heavy ends. If those are correct, ensure that the jumper cables are correctly aligned. Negative battery cable are usually black, labeled with a negative (-) sign, and consist of a large cable with one or more smaller wires branching out from the battery terminal side of the cable. My car has 118000 miles. Just fast clicking sounds (from the starter I think) and then I noticed the negative battery cable was smoking right where it connects to the battery terminal. Let me explain, I fish from a small rental boat and the motor connects to the battery with clips, like the ones on a battery charger. This could mean that the battery cable is loose and needs to be tightened or it could indicate that there is something else causing the increased resistance like a corroded battery cable. Sep 1, 2005. Negative battery cable Negative battery cable are usually black, labeled with a negative (-) sign, and consist of a large cable with one or more smaller wires branching out from the battery terminal side of the cable. The negative battery cable is bolted to the engine block of the vehicle, which provide grounding for the ignition system. When you remove one jump lead after starting there could be a spark which ignites that hydrogen. I wanted to get some ideas on troubleshooting. I just replaced my HG and am having a similar problem. The jumper cables also got very hot while trying to jump the car, even though everything was connected correctly. jimh. Why is my Negative Battery Cable Hot? Why is my Negative Battery Cable Hot? 71. Remove both cables from the battery, then set a multimeter for continuity mode. I hook up a set of jumper cables from my wifes truck to the battery and it connections from teh battery to the connection points on the starter for the positive and the block and frame for the negative. I am confused at this point. Problem solved So, talking to the guy at West Marine, he said I had no reason having the perko switch I did, and that all I need is a simple on/off switch between my wire that goes from positive Battery 1 to Negative battery 2 (so i get 24 volts out of my two 12V batteries). It takes more than 400 amps to smoke a big ground wire. My negative battery cable is smoking and is hot on the battery terminal when the car is running.I just put a new battery in last week but noticed a burning smell from the engine today. 1977 K10 Stepside : daily "gas getter" haha. Why are my battery cables smoking? I agree either a loose or very corroded connection making a poor contact causing excessive resistance. Then, describe your "battery bank", how many cables are involved, and what each one is attached to. I installed the positive first then went to do the negitive and huge spark/smoke and I see my terminal melted on the one side. The negative battery cable is bolted to the engine block of the vehicle, which provide grounding for the ignition system. SO you might get by with cleaning the battery & wire really well then drilling a new hole or filing to old one enough to I put on a new neg. Also if you have a loose wire connection you will get a very high resistances at the loose connection causing a wire to burn. 36. I have a similar issue, battery keeps going flat, just now my negative terminal cable bolton melted completely off. ground. Hi there. Installed with the stock battery cables run to my red top Optima. Start by removing the battery terminals the negative should be first. Then it's a matter of tracing your wiring to find the culprit. . Start with the grounds. Battery terminal smoking!!! The wire that was smoking looks like it might be ok, except for the rubber that burnt off. A brand-new Chevrolet negative battery cable from the dealer parts department cost just shy of $100. If the "smoking" issue didn't occur until you tried to start the motor, there could be a shorting occurance in the starter motor. See if the small remote wire on the starter solenoid is touching the main battery cable wire on the starter solenoid. When spooling the cable in with just the weight of the truck on level ground, the motor overheats and starts smoking after just 15ft of line pull. The negative will go to the metal of the car somewhere (usually near the battery), and the positive usually goes off to an electrical junction box or to the starter. That along with the high amount of power it is using to try and start will make it get very hot.The terminals on a lead acid battery can even melt from the heat.A hot cable and battery can cause injury. Check for burned or bare wires or maybe a bad battery cable?? Having a hot negative battery cable is a sign that there is increased resistance in the battery cable. Smoke is usually a sign of a loose connection. Alternator and both batteries I have are good. The terminal became loose and sparked. It appears that water somehow infiltrates the covering of the cable and rots out the cable from the inside. While reinstalling my battery after working on my 94 sentra my negitive battery cable melted my negitive terminal. battery and so far so good. Click to see full answer Hereof, why does negative battery terminal get hot? Having a hot negative battery cable is a sign that there is increased resistance in the battery cable. ground. When using jumper cables which goes on first? While plugged in and the wire connected, I checked the battery voltage and it reads 11V. Battery cables Help!!! Trace the wires. Use a decent pair of jump leads, because even a decent alternator only puts out 60A or so. When attaching the battery cables, place the positive cable on first and then the ground cable. Im assuming that cable sends the power back to keep the battery charged. Also, the ground, or negative cable, should not be touching anything metal while the positive cable is hooked up. I popped it and saw the negative battery terminal was smoking and was extremely hot to the touch. my question is why is the solenoid smoking and should the cable be going to the starter solenoid or directly to the battery? The wire that was smoking looks like it might be ok, except for the rubber that burnt off. The car will not start, yet I had it the battery charged and it cranked right up. Answer (1 of 10): Because you're putting too much current through them. I unplugged the camper and disconnected the negative wire from it's terminal. posted 07-21-2006 01:40 PM ET (US) If in the cable itself, back a ways from the ends and under the insulation, enough copper (conductor) has turned into cuprous oxide (semi-conductor), the resistance could be too high. I am not sure I am posting this in the right section. This would include the main power cable from the starter to the positive terminal and the ground cable from the negative terminal. We fixed the truck by replacing the battery cable. Sounds like you are having ground problems, here is something to try. Apr 7, 2012. If your battery has excessive corrosion on the terminals, you will need to use a baking soda-water solution and an old toothbrush. Then it's a matter of tracing your wiring to find the culprit. Smoke is usually a sign of a loose connection. Watch the positive cable going to the starter and make sure that it does not touch the case or the engine block. Skip to Step 6 if your battery is maintenance-free. Set the dial on the continuity function and put the leads on each of your battery cables. 36. There is no engine light on battery light not on the car is running but the negative battery cable is smoking and hot.please help . Jul 18, 2005. Why is the Negative Battery Cable Hot? It is unlikely to be when you attach the cables the battery is not at that point being charged.. thanks for the help. battery cable since the other was a mess. It is a new battery, cable, and lead. A hot cable and battery can cause injury. Bad ground or bad starter. Why is my battery smoking? Your campaign number 02v288000. I popped it and saw the negative battery terminal was smoking and was extremely hot to the touch. Replace both ends of your battery connectors. #181253 - 09/13/06 04:31 AM Re: fried my negative battery cable, why? Old, frayed cable ends may have exposed wires, which will cause arcing to other metal parts, resulting in a melted battery terminal. If you attach one cable to a bare metal point on the frame that is not right next to the battery, there are two Was this answer helpful? I connect the + battery cable first and then connected the negative side, the horn went off and there was spark, smoke, crackling, etc on the negative terminal. This could mean that the battery cable is loose and needs to be tightened or it could indicate that there is something else causing the increased resistance like a corroded battery cable. My leads are rated 200A. If you did not have those sparks before, it is possible that you crossed the starter wires somewhere. I just installed a winch, and about 3 seconds after I ran it, my ground wires from the battry terminal to the firewall and the distributor housing to the firewall started smoking and then blew (all with my back to it since I was watching the cable)Mind you, the winch is operating properly because I Probably got too hot. If there is too high amperage being transferred with the cables, that can melt the insulation and cause smoke. If they are transferring that much power, disconnect them and let them cool, since youre pulling that amount of DC current off the running car and its battery, which is also a bad thing.
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