Need Help with Rear Jump-Start Location NOT Working

[NSXTASIE]

Hi guys,

Long time owner and lurker finally checking in.

I don't drive my NSX often anymore which requires a jump-start every other month when I take her out.

Over the past 8 years, I have been very accustomed to jump-starting the car from the Rear Fuse Box located in the engine bay.


Last week, I needed a jump-start again and did the usual setup.

As any time round, with all jump-start battery and cables in place, I put the key in the ignition, turned it half way and all lights came on as usual.

But this time, as I turned-in the rest of the key, I heard a VERY subtle pop and all lights died down with no more response whatsoever.

I checked the negative jump-start cable, unplugged and re-plugged it and noticed no sparks from the clamp when it touches ground. The current is no longer passing through.


I knew my jump-start battery and cables are intact so I attempted jump-starting from the Front end, directly to the battery and it worked. The car runs fine, no problem.


Now though, I can no longer jump-start from the Rear Fuse Box. Can someone please tell me in why isn't there any current passing through to the battery?

I feel that the subtle pop was some sort of blown fuse but cannot find the answer myself by reading the Owner's Manual.

Can anybody please shine me a light? I really don't want to rely on jump-starting from the Front and remove my spare-tire everytime.


Many thanks in advance and hope this will be a simple fix. Fingers crossed.:redface:

 

[chrisbailey13]

So,

My response won't directly resolve your problem...but you should get a battery tender.

 

[Timeless1]

My response won't either but once you fix the problem, i recommend the old fashion way & try to start/warm up your car at least every other day to keep the fluids circulating & battery charged.

 

[EdinKali]

Sounds like you have a bad ground or bad connection at the rear positive jump location. Clean the connections and check continuity with an ohm meter.

Secondly, get a new battery and a battery tender. Running your car with a dead battery is hard on the alternator and voltage regulator as it is constantly trying to charge a dead battery at max charge rate, that won't hold a charge.

 

[1991NSX]

After doing that a cell will go bad in the battery. Like everyone has said, get a tender!

 

[comtec]

Where are you connecting the jumper cable ground? If to the engine then check the engine ground wires. I believe there are two engine ground wires and one throttle body ground wire.

Mike

 

[robbiedawg]

an nsx mechanic told me these are hard cars to jump,and he only does it by connecting the cables directly to the dead battery on the nsx,including the negative ,which i know generally you're not supposed to do.he didn't think the engine compartment jump worked very well.

 

[Timeless1]

Well, my car didn't start today since it's been park for over a week. I pulled out the good ol recharger/jumpstart & as always had no problems whatsoever accessing the battery even with the spare tire still intact. (a little tight but still room to get to the terminals).

 

[Grimeas]

I imagine obviously that the jump pack has power in it but that could be bad. I would hook it up to another car and allow the battery to charge for awhile 15-20 mins then try to start your car. Leave the car that will charge the dead battery running. Make sure you allow the NSX sufficient time to recharge then turn it off while your at home to see if it will restart and make sure your battery isn't shot now. I already have killed a battery because it drained down to many times. Also to make sure you get a good connection clean both of the cars battery terminals off with a wire brush. If the battery is completely dead or is down a cell or 2 it will not restart untill the dead battery is charge up a decent amount

 

[latzke]

But this time, as I turned-in the rest of the key, I heard a VERY subtle pop and all lights died down with no more response whatsoever.

I checked the negative jump-start cable, unplugged and re-plugged it and noticed no sparks from the clamp when it touches ground. The current is no longer passing through.

Looking at the block where the positive connects it is so much a part of the power-delivery system that you can't isolate it without a bunch of other things (like the starter) not working...so I have to assume the problem is with the negative side. Make sure whatever you're connecting that to is still fully part of the car (bolt hasn't backed out or corroded, etc). You could also try another unpainted metal contact point back there (something attached to the throttle body) for connecting ground.

My response won't either but once you fix the problem, i recommend the old fashion way & try to start/warm up your car at least every other day to keep the fluids circulating & battery charged.

Once every other day? That is totally excessive unless you are giving advice on how to unnecessarily wear things out.

Just put a tender on it. NSXTASIE, I've permanently attached the "ring connectors" cable from this battery tender to the same locations you use for jumping (screw on rear side of positive block, one of the throttle body bolts for negative). Makes it real easy to plug in the tender when car won't be driven for a couple weeks or more. If you use a similar tender that will do 6 or 12v, use a hot glue gun to secure the switch in the 12v position.

Well, my car didn't start today since it's been park for over a week. I pulled out the good ol recharger/jumpstart & as always had no problems whatsoever accessing the battery even with the spare tire still intact. (a little tight but still room to get to the terminals).

The jump location doesn't exist because it is impossible to reach the battery...but to make things a lot easier. Working at waist-high on something you can clearly see is far superior to bending way over and down to fiddle in the dim and cramped battery area.

 

[Briank]

The likely problem is you are not getting a good ground connection in the engine bay. You are using the marked ground connection in the throttle body?