My daughter calls..truck won't crank, she gets a jump but not on batt. but fuse relay center-aux studs "as shown". truck starts but now missing int.lamps,wipers and other stuff...I quickly probed fuses-OK. I did also put a new batt. in..neg.had been helicoiled? it was shot. I also figured what the hay...might as well do the ign. switch while were at it. all seems well except for the circuits from the jump start?? any ideas? Thanks!
Blown megafuse or what? after jumpstart..
- Thread starter moneypit
- Start date
STLtrailbSS
Member
- Dec 4, 2011
- 1,617
Hopefully Roadie can chime in he had a write up on the OS. Although I have never had this happen it has been discussed its known as the Mega fuse. That 125amp fuse shown usually spells for bad news when jumped.
Shdwdrgn
Member
- Dec 4, 2011
- 568
I really don't understand this. I kept seeing it mentioned over on the OS as well, and the absurdity just baffles me. The battery is right there... what genius puts the jumper cables on some unknown wires rather than the battery terminals which are just inches away and easily accessible?
Blckshdw
Moderator
The megafuse (the 125A fuse between those 2 studs) is blown. Replace that, tell your daughter to never get a jump from those studs again, and all will be fine.
djthumper
Administrator
Blckshdw said:
Sounds like Carlton knows first hand. 
Blckshdw
Moderator
djthumper said:
Second hand actually
That, and I've seen those countless posts on the OS about it.
barron03
Member
- Nov 20, 2011
- 960
Attachments
Thanks everyone, I went to parts store since dealer closed and got a temp. 175a all they had-works good, then next week I'll replace with 125a and use the 175a for a spare. Yes it's amazing just how naive college kids can be these days........ We're off for a testdrive now but all should be good after todays work.....
Mooseman
Moderator
There are some vehicles (like our Montana), you can't get to the battery and there is a post, similar to our mega-fuse posts, which is used for jump starting. You just have to know to not use these for jump starting. Maybe just stick a label there instructing to not use these for the times you are not there getting the jump.
Exactly...Yea I use to have a 2000 Olds Silhouette that had the additional post for jumping.Mooseman said:
The problem was made worse by the IDIOT designers who put RED and BLACK on those two megafuse terminals, and they BOTH should have been RED.
That, and folks who never read the Owner's Manual, and AAA who hires goofballs, and good Samaritans who give jumps without clues, etc., etc.
That, and folks who never read the Owner's Manual, and AAA who hires goofballs, and good Samaritans who give jumps without clues, etc., etc.
Chickenhawk
Member
- Dec 6, 2011
- 783
Owners Manuals. Good reading. Page 5-44 on my 04; page 432 on my 07:
"The other end of the negative (−) cable doesn’t go to the dead battery. It goes to a heavy, unpainted metal engine part on the vehicle with the dead battery. In the L6 engine, the remote negative (−) terminal is located on the front engine lift bracket and is marked GND. In the V8 engine, the remote negative (–) terminal is located on the accessory drive bracket and is marked GND."
Everyone. List your hood. Find the bracket. Read the "GND" clearly marked on it. Show it to your spouses and your sons/daughters.
Trust me; the day you have a battery explode in your face and feel your skin begin to burn off within seconds, you will ALWAYS treat batteries with a lot more respect.
Thankfully, the mechanic took the brunt of the explosion and there was a tire test tank within three steps of where we were. That tire test tank had the dirtiest, grungiest most foul water I had ever seen in my life. We didn't care. It saved us both from further damage, and was the most welcome water in the world.
Now, just for fun, take a look around your own shop or workplace. Do you ever work with materials that may require an emergency eye wash station or an emergency shower? Can you get to it quickly with your eyes closed?
"The other end of the negative (−) cable doesn’t go to the dead battery. It goes to a heavy, unpainted metal engine part on the vehicle with the dead battery. In the L6 engine, the remote negative (−) terminal is located on the front engine lift bracket and is marked GND. In the V8 engine, the remote negative (–) terminal is located on the accessory drive bracket and is marked GND."
Everyone. List your hood. Find the bracket. Read the "GND" clearly marked on it. Show it to your spouses and your sons/daughters.
Trust me; the day you have a battery explode in your face and feel your skin begin to burn off within seconds, you will ALWAYS treat batteries with a lot more respect.
Thankfully, the mechanic took the brunt of the explosion and there was a tire test tank within three steps of where we were. That tire test tank had the dirtiest, grungiest most foul water I had ever seen in my life. We didn't care. It saved us both from further damage, and was the most welcome water in the world.
Now, just for fun, take a look around your own shop or workplace. Do you ever work with materials that may require an emergency eye wash station or an emergency shower? Can you get to it quickly with your eyes closed?