New battery no power or spark…

[Chvytahoe11]

Long story short… I messed up last night as I was trying to swap batteries. I accidentally connected the cables to the wrong terminals ‍‍‍, it was at night and really was trying to rush and did pay attention . Anyway, this morning went back out to properly install the battery. Now there’s no power or even spark from the battery it’s self. Anyone have this happen to them before ?? Where should I start looking to replace ?? Fuses??
Thanks in advance !!

 

[j91z28d1]

ouch.. there was one other guy that did that on accident. he had the truck going crazy. after someone noticed. he disappeared. I wish I knew what happened.

I had a buddy do it in a old bronco 2 and never got it fixed. these trucks are totally different so that doesn't mean anything for you, just saying it happens.


it's a bit scary the car battery is dead, makes it sound like it didn't just pop a fuse but something stayed powered up.

having never done it, I cna only say what if try first, I'd get the battery back charged up, and start at the main mega fuse. and go from there checking the fuses in the fuse box. after that, if you can get some power to the obd port, plug in a scanner and see if you can talk to any of the modules. I'd be worried about the body control module. I think most of the power runs thru there first.

 

[Joseph Garcia]

Disconnect the two wires to the battery and touch them together for about 5 seconds. Then, re-attach the wires to the battery and see if the condition changes. This is a long shot, but it is worth a try.

If still no luck, take the battery to a local parts store with a bench battery load tester and get it load tested.

 

[Chvytahoe11]

Disconnect the two wires to the battery and touch them together for about 5 seconds. Then, re-attach the wires to the battery and see if the condition changes. This is a long shot, but it is worth a try.

If still no luck, take the battery to a local parts store with a bench battery load tester and get it load tested.

Just took it and it’s good… can’t believe I made this stupid mistake…

 

[Chvytahoe11]

ouch.. there was one other guy that did that on accident. he had the truck going crazy. after someone noticed. he disappeared. I wish I knew what happened.

I had a buddy do it in a old bronco 2 and never got it fixed. these trucks are totally different so that doesn't mean anything for you, just saying it happens.


it's a bit scary the car battery is dead, makes it sound like it didn't just pop a fuse but something stayed powered up.

having never done it, I cna only say what if try first, I'd get the battery back charged up, and start at the main mega fuse. and go from there checking the fuses in the fuse box. after that, if you can get some power to the obd port, plug in a scanner and see if you can talk to any of the modules. I'd be worried about the body control module. I think most of the power runs thru there first.

Do you know which fuses they are? Ive looked at the ones under the hood and the side panel of the dashboard.. cant figure it out..

 

[mikez71]

Big fuse should be on the battery or on the firewall close to battery. Follow the big red cable from battery..

 

[rdezs]

50 years ago, you would have only blown out the diode in the alternator. With the electronics these days, it's a rather frightening scenario. Rather impossible to know exactly how many circuits are fried before the main fuse near the battery terminal blew.... If it even did. You're going to need to follow a schematic, and follow it and test all modules along the way. A Tech 2 is your friend here, once you get power to the OBD2 port.

 

[tuckerrnr1]

I can't offer much help but want to say don't beat yourself up over it. Mistakes happen, hopefully it is an inexpensive remedy.

 

[Chvytahoe11]

Big fuse should be on the battery or on the firewall close to battery. Follow the big red cable from battery..

I guess first place to start would be replacing the positive cable??

 

[j91z28d1]

I guess first place to start would be replacing the positive cable??

I guess my question would be, do you have a volt meter or some way to check for voltage?

that fuse you see in your Pic is the 175amp meg fuse. if you can install the battery the correct way, and check for voltage after it, to see if it's blown.

then you'll basically have to continue to check for voltage along the way thru the system till you either find some place that doesn't have it but should. or find you have power to the correct pins of a module but that module is dead. this is going to be a bit of a learning curve if you don't have much electrical experience trouble shooting

 

[mikez71]

I guess first place to start would be replacing the positive cable??

That's the fuse.. If you can make a wire spark across the battery terminals, you could try and spark a wire from the left terminal pictured to the battery negative..
Should spark the same.. If no spark, it's that fuse.

----------------------------------------

THEN AGAIN.. trying to spark it... may pop that fuse.. (might not?)

well it was an idea, but a better idea would be to just hook up a 12V light of some sort...
...at which point you might as well just order a multimeter from amazon for cheap.

Yea what the guy below said!

 

[Doubeleive]

for the love of god just check for continuity on the fuse, that's it's primary function is to prevent a electrical surge.
if you do not have a meter just connect a brake light bulb to the negative of the battery and to both ends of the fuse, if the end away from the battery does not light the bulb there's your clue....

 

[mikez71]

He's already been touching battery cables in the wrong spot, I figured my wire-spark method would be familiar to him..

 

[j91z28d1]

yeah, it's not common but car batterys do explode from time to time. sparks around them on purpose is worth avoiding.

 

[Chvytahoe11]

I guess my question would be, do you have a volt meter or some way to check for voltage?

that fuse you see in your Pic is the 175amp meg fuse. if you can install the battery the correct way, and check for voltage after it, to see if it's blown.

then you'll basically have to continue to check for voltage along the way thru the system till you either find some place that doesn't have it but should. or find you have power to the correct pins of a module but that module is dead. this is going to be a bit of a learning curve if you don't have much electrical experience trouble shooting

I don’t have. A way to check the voltage but I will get the tool to check it tomorrow.

 

[Chvytahoe11]

I guess my question would be, do you have a volt meter or some way to check for voltage?

that fuse you see in your Pic is the 175amp meg fuse. if you can install the battery the correct way, and check for voltage after it, to see if it's blown.

then you'll basically have to continue to check for voltage along the way thru the system till you either find some place that doesn't have it but should. or find you have power to the correct pins of a module but that module is dead. this is going to be a bit of a learning curve if you don't have much electrical experience trouble shooting

Checked after the fuse and it’s getting voltage 12.7… checked the negative terminal.. didn’t get a reading… also not sure if I tested at the right places ..but shouldn’t there be voltage on it as well??

 

[j91z28d1]

Checked after the fuse and it’s getting voltage 12.7… checked the negative terminal.. didn’t get a reading… also not sure if I tested at the right places ..but shouldn’t there be voltage on it as well??

I'm not sure you did that right looking at the pics.. . hang on.


so black probe on the neg post of the battery. putt he red probe on the pos, you should see 12v. on the meter. and then leave the black on the neg post, move the red to after the fuse. you should still see 12v. if not, fuse it blown.

if I'm seeing it right in the pic you're doing a voltage drop test, which is good to do and know but much but harder to explain the results right now.

 

[Chvytahoe11]

I'm not sure you did that right looking at the pics.. . hang on.


so black probe on the neg post of the battery. putt he red probe on the pos, you should see 12v. on the meter. and then leave the black on the neg post, move the red to after the fuse. you should still see 12v. if not, fuse it blown.

if I'm seeing it right in the pic you're doing a voltage drop test, which is good to do and know but much but harder to explain the results right now.

Makes sense now… thanks!!!! … yes there’s no current after the fuse… I checked just about all the fuses and relays and all are good .. going to run down to get a new + terminal and hopefully swap it out today or tomorrow morning.

 

[j91z28d1]

my truck doesn't have that same setup, but I'm pretty sure you can just replace the fuse itself. make sure you take the neg side off the battery while working on the fuse thou.

that might only be the start of it all.

 

[Chvytahoe11]

my truck doesn't have that same setup, but I'm pretty sure you can just replace the fuse itself. make sure you take the neg side off the battery while working on the fuse thou.

that might only be the start of it all.

This is the one they had .. I’m assuming this will do?? 175 amp 70v