I read the forums here. I got the right AGM battery. I read the instructions here which matched the instructions by 2 different Jag dealers. I changed the battery and now the car is dead. What is going on? All electronics are out.

 

Talofa. I would say to start with verifying that you have plus to plus, minus to minus. It could very easily be that you have a battery with the terminals backwards. Granted, should have seen this when trying to apply the terminals as they would not have fit well. The next thing I would look at is the mega fuse (400 amp as I recall) in the fuse box. It is possible that you shocked the system and blew this fuse. You would not be the first to have this fuse go bad. After that, it is going to be a little bit of figuring out which fuse boxes have power and which don't, then determining where the loss of power occurs. If you reach this point, let me know.

I lived a few years on the island, off of Kam Highway (near the airport). So, if you knew somoene with a lifted green Expedition, that would be me. Granted, this was 20 years ago. I had the only lifted expedition on the island until just before I left when someone got their hands on the 1st of the "Himylayan Expeditions". You would know that one as it was a 2wd unit with big spacers to fit the tires and it had a 10" lift on it.

 

Should be simple to find?
Get a DMM and start checking for voltage at various places.

Can you post what car you have and what battery you installed?
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Got it, checking fuze. Terminals are/were connected correctly. Never knew anybody with a truck. The rail project construction turned the Hwy into a noisy dead zone with most businesses gone, from the airport to Nimitz, and now they are going to continue to Ala Moana Ctr.

 

2014 Jag XJ V6, installed size 48 AGM H8 batt.

 

Arf.

 

Pulled the large black fuze, looks like a black bow with 4 blades, how do I test it's viability? Just get a new one? No multimeter available.

 

You're describing a relay, not a fuse. This is probably at the point where you should enlist the help of someone local.

 

what was the reason for changing the battery ,also when you hit the start button does the dash light up

 

Sometimes I go all the way back to the most simple problem that is often overlooked. While this is a new battery, are you positive it's actually charged? I mean I'm sure it is, but but if you are assuming that the battery is fully charged enough to wake the car up, I would not assume that. I don't know what options you have available but digital multimeters are pretty inexpensive and kind of a must for figuring out this situation to be honest. Electronics is not a good exercise and guessing. I too am curious why battery was replaced in the first place. If it was because the car was dead, did you actually have the battery tested and verify. Because it could have been a totally different problem that you still have.

Mike

 

 

This one is in stock at the Walmart in Honolulu. You can use it for all sorts of things around the house too.

 

No electrical activity whatsoever.

 

Farm-Jag:

Car began to have a harder time starting, would stall during driving when I turned the audio up loud, cluster wouldn't turn on at times, decided to start simple with a battery change as I got the car used and neglected and was still in the process of restoring it. The old battery was running in bad shape, then I got a new one from AutoZone, installed it and all electrical systems went dead. Re-installed the old battery and no joy, put the new one back in and still dead. Tried to start the car, none of the buttons even evoke a weak response as low voltage would.

 

Didn't know they were that cheap, thanks.

 

Autozone probably has them also for a similar price. Sounds to me like the issue is possibly not your battery at all. Or, 2 things could have been broken at the same time on a vehicle. The battery might have been bad but also some other issue. I'd say that you can't really figure this out without the bare minimum of a multimeter.

Oh I just looked it up. There's a Harbor Freight in Honolulu it seems. That's definitely going to be your cheapest place most likely to get not only this multimeter but a full host of other things if you ever need.

 

Multimeter says both new and old batteries are fine, the AUX battery is completely dead.

 

Nostyle, completely disconnect the aux battery. Your car will work fine without it. The only "problem" is that your start/stop functionality will be disabled. Based on what you are saying, I would anticipate you also getting an error/warning about the parking brake. This will be fixed by simply engaging the e-brake once so it can relearn where the stop point is.

Let me check the diagrams that I have to see if I can find any fuseable links near the back. I know there are 2 of them under the hood of the car in the fuse box there. They are normally a small "black box" with large blades that are bolted down (not a compression/slip type joint). When you open up the fuse box under the hood, you will see them on the right side of the fuse box. I use these to run my vacuum pump when changing the oil.

I would tell you to go to an auto body shop off of Puuloa Road (All Kine AUto). I believe this is the place I used to go to for my vehicle inspections. Worst case, you have LIm's Auto Electric which seems to get some good reviews.

 

Thanks to everyone for their help.

WHAT HAPPENED: Everyone who said it was a blown mega fuze was right. I didn't have time to learn how to get into the fuze holder and it was dark + I had to get ready to get the car towed the next day so I couldn't do anything else. Took it to a shop and they changed the fuze & reset the battery monitor.

 

Great outcome but why did that massive fuse blow? Maybe when the battery was changed they touched something and caused it? Those mega fuse are huge so your talking a LOT of amps to blow one out.
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