12 volt batt adventure

statultra · 11-18-2007, 09:13 PM

i started my prius other day to find out it barely had power to startup, i then turned on the screen to the check voltage on the acc mode teh battery had 11.9 but when the vehicle was turned on ( not ready mode ) battery went down to 9.9

i was about to buy a 12 volt battery.

so i decided to take apart the ground cable from the body and the positive lead, i discovered the ground wire, the portion that bolts on the body was corodded, this resulted in lower voltages, as soon as i wirebrushed and hooked it back up everything was back to normal.

just a word of advice if any of you have 12v battery problems on older nhw20 prius check the ground cables

Inches · 11-18-2007, 10:19 PM

Was the corrosion on the battery terminals themselves or elseware??

hobbit · 11-19-2007, 12:14 AM

You got corrosion that bad in an *'05*? How? My '04 battery area
is pristine.
.
_H*

icarus · 11-19-2007, 02:50 AM

<div class='quotetop'>QUOTE(hobbit @ Nov 18 2007, 09:14 PM) [snapback]541440[/snapback]</div>

Quote:

You got corrosion that bad in an *'05*? How? My '04 battery area
is pristine.
.
_H*
[/b]

Salt air perhaps. Consider greasing the cable ends to keep the salt air away. (I see you are in Cape Corral Fla.

Icarus

<div class='quotetop'>QUOTE(hobbit @ Nov 18 2007, 09:14 PM) [snapback]541440[/snapback]</div>

Quote:

You got corrosion that bad in an *'05*? How? My '04 battery area
is pristine.
.
_H*
[/b]

Salt air perhaps. Consider greasing the cable ends to keep the salt air away. (I see you are in Cape Corral Fla.

Icarus

jayman · 11-19-2007, 12:50 PM

Every fall I back off and tighten again the bolt that holds the battery ground wire to the unitbody. If you drive in an area with road salt, or live near salt water, don't be surprised if ground points start to corrode on their own

Even if the battery posts look clean, the body ground bolts may have heavy corrosion. It helps if you can reach behind that area and spray an anticorrosion product like LPS 3 or Fluid Film. Sometimes the only way to get the waxy fluid is to remove the bolt, liberally spray the product into the hole, and then put the bolt back on.

Around 10 years ago, the '84 Ford F-150 at my hobby farm I use as a plow and work truck, started to cranky VERY slowly. Tried a new battery, nadda. New starter and starter cable, nada. New starter solenoid, zip. I then decided to replace the battery cables

The negative cable on the 302 is attached to the engine block. When I tried to remove the bolt, it snapped right off, it was corroded almost all the way through. Had to drill out and tap for a new bolt. No more sluggish cranking

statultra · 11-19-2007, 05:46 PM

the corrosion was on the part where the ground wire bolts on the body

this was salvaged, so i just had the wires disconnected completely, so i guess it would rust? the rust isnt really bad, its just like a light coat on top of the connector that the bolts go thruogh

**efusco** · 11-19-2007, 05:52 PM

FWIW, when I changed my battery last month that body bolt showed no signs of corrosion at all...it was clean and shiny like new...the entire area was for that matter.

statultra · 11-19-2007, 11:26 PM

well u know part of the reason i think was the bolt was not tight, so it kinda arced probably corodding it.

it was a salvage car so when i got it i had to pull battery out and trickle charge while i worked on it

richard schumacher · 11-20-2007, 12:09 PM

Salvaged from a flood, maybe. Good luck with it.

DGH · 11-21-2007, 06:30 PM

A bit of dielectric silicone compound, on the battery terminals and hardware, is a good thing.

11-18-2007, 09:13 PM	#1
statultra uber-Senior Member Join Date: Dec 2005 Location: cape coral, FL Posts: 534 My Car: 2005 Prius Package: #9 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	i started my prius other day to find out it barely had power to startup, i then turned on the screen to the check voltage on the acc mode teh battery had 11.9 but when the vehicle was turned on ( not ready mode ) battery went down to 9.9 i was about to buy a 12 volt battery. so i decided to take apart the ground cable from the body and the positive lead, i discovered the ground wire, the portion that bolts on the body was corodded, this resulted in lower voltages, as soon as i wirebrushed and hooked it back up everything was back to normal. just a word of advice if any of you have 12v battery problems on older nhw20 prius check the ground cables __________________ 2005 Toyota Prius Hybrid Package 9 2001 Toyota Prius 2005 Honda Accord Hybrid 3.0 V6

11-19-2007, 12:50 PM	#5
jayman Senior Member Join Date: Oct 2004 Location: Winnipeg Manitoba Posts: 6,168 My Car: 2004 Prius Package: B Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 4	Every fall I back off and tighten again the bolt that holds the battery ground wire to the unitbody. If you drive in an area with road salt, or live near salt water, don't be surprised if ground points start to corrode on their own Even if the battery posts look clean, the body ground bolts may have heavy corrosion. It helps if you can reach behind that area and spray an anticorrosion product like LPS 3 or Fluid Film. Sometimes the only way to get the waxy fluid is to remove the bolt, liberally spray the product into the hole, and then put the bolt back on. Around 10 years ago, the '84 Ford F-150 at my hobby farm I use as a plow and work truck, started to cranky VERY slowly. Tried a new battery, nadda. New starter and starter cable, nada. New starter solenoid, zip. I then decided to replace the battery cables The negative cable on the 302 is attached to the engine block. When I tried to remove the bolt, it snapped right off, it was corroded almost all the way through. Had to drill out and tap for a new bolt. No more sluggish cranking __________________ 2004 Toyota Prius "B", Tideland Pearl 2007 Toyota FJ Cruiser 5AT "C", Sun Fusion

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Adventure to try and get Nav working on an Import	philipnewton1	Audio and Electronics	5	02-13-2008 06:43 PM
classic prius hv batt vs new prius hv batt	statultra	Prius Technical Discussion	4	11-27-2006 04:47 PM
Where is the SMR & batt ECU in '06	pnerd	Prius Technical Discussion	1	07-12-2006 09:10 AM
Prius goes on an adventure, acquits itself very well!	aarons12	Prius Main Forum	6	12-14-2004 07:06 PM
Nav System Adventure	bparrish	Audio and Electronics	24	09-15-2004 10:55 AM

11-18-2007, 10:19 PM	#2
Inches Member Join Date: Jun 2007 Location: San Mateo, CA Posts: 86 My Car: 2007 Prius Package: #6 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Was the corrosion on the battery terminals themselves or elseware??

11-19-2007, 12:14 AM	#3
hobbit Senior Member Join Date: Mar 2005 Location: Bahstahn Posts: 2,821 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	You got corrosion that bad in an '05? How? My '04 battery area is pristine. . _H*

11-19-2007, 05:46 PM	#6
statultra uber-Senior Member Join Date: Dec 2005 Location: cape coral, FL Posts: 534 My Car: 2005 Prius Package: #9 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	the corrosion was on the part where the ground wire bolts on the body this was salvaged, so i just had the wires disconnected completely, so i guess it would rust? the rust isnt really bad, its just like a light coat on top of the connector that the bolts go thruogh

11-19-2007, 05:52 PM	#7
efusco Troll Slayer Join Date: Nov 2003 Location: Nixa, MO Posts: 12,942 My Car: 2004 Prius Package: #9 Nominated 1 Time in 1 Post TOTM Awards: 0 Friends: 21	FWIW, when I changed my battery last month that body bolt showed no signs of corrosion at all...it was clean and shiny like new...the entire area was for that matter.

11-19-2007, 11:26 PM	#8
statultra uber-Senior Member Join Date: Dec 2005 Location: cape coral, FL Posts: 534 My Car: 2005 Prius Package: #9 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	well u know part of the reason i think was the bolt was not tight, so it kinda arced probably corodding it. it was a salvage car so when i got it i had to pull battery out and trickle charge while i worked on it

11-20-2007, 12:09 PM	#9
richard schumacher ichorous liquor Join Date: Mar 2004 Location: United States Posts: 3,892 My Car: 2004 Prius Package: #6 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Salvaged from a flood, maybe. Good luck with it.

11-21-2007, 06:30 PM	#10
DGH Member Join Date: Aug 2006 Posts: 86 My Car: 2006 Prius Package: #8 Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	A bit of dielectric silicone compound, on the battery terminals and hardware, is a good thing.