Recent Topics
2005 Ford Taurus Fram Cabin Filter
by Snagglefoot - 11/15/19 12:15 PM
Is 10 microns concidered a bypass filter?
by jkhawaii - 11/15/19 12:09 PM
2018 Charger Hellcat 12,000 mile update
by mbacfp - 11/15/19 11:51 AM
Automotive Oscilloscope
by LazyDog - 11/15/19 11:42 AM
Let’s see how this looks after 4 seasons
by Bettez88 - 11/15/19 11:04 AM
Interstate batteries problems
by JimPghPA - 11/15/19 09:49 AM
2008 Dodge Ram 3500, first sample
by A_Harman - 11/15/19 09:44 AM
Steelers/Browns
by CourierDriver - 11/15/19 09:04 AM
Beard care in cold weather?
by pandus13 - 11/15/19 08:39 AM
Door Sill protection for new car - which one?
by henni - 11/15/19 08:18 AM
Exterior Home Security Cameras?
by Gebo - 11/15/19 08:13 AM
5w-20 ok for GMC 6.2l ?
by jdw1222 - 11/15/19 08:02 AM
M. Defender vs Cont. TrueContact Tour?
by lukejo - 11/15/19 07:53 AM
Alternative for Lexus Toyota WS
by Joephu - 11/15/19 06:19 AM
F1 - 2019 Brazilian Grand Prix
by gofast182 - 11/15/19 06:10 AM
2019 i30 Nline 1.6T and first service (1500km)
by rov137 - 11/14/19 10:11 PM
Garbage Disposal Replacement
by bunnspecial - 11/14/19 09:58 PM
Nest thermostat
by miden851 - 11/14/19 09:06 PM
2011 G37X
by maverickfhs - 11/14/19 08:27 PM
Recommendations for oil filter
by dawgn86 - 11/14/19 07:38 PM
Newest Members
DjS71, Akhunter, rov137, Dorisy, DesktopDave
69870 Registered Users
Who's Online Now
93 registered members (Anduril, BeerCan, 28oz, Benzadmiral, austinlunsford, 9 invisible), 2,100 guests, and 47 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics297,443
Posts5,115,899
Members69,870
Most Online3,589
Nov 2nd, 2019
Donate to BITOG
Print Thread
Hop To
Group 78 Battery Connector Issues #5245521 10/20/19 11:37 PM
Joined: Oct 2008
Posts: 4,280
F
Falcon_LS Offline OP
OP Offline
F
Joined: Oct 2008
Posts: 4,280
Weird bit of a problem on the '05 GMC Envoy yesterday. Turned the key to fire up, and I usually wait until the fuel pump primes before cranking. Soon as I cranked, all the electrics died - dome lights, instrument cluster, audio head unit. I couldn't even turn the key back to the lock position.

The Motorcraft branded (BXT-78E) East Penn I got is only 2 years old. Popped the hood, checked battery voltage and it was 12.6 V, load test dropped that down to 10.1 V. But as soon as I touched the battery connectors, the lights came back on. The truck wouldn't start, and everything died again, but I had an 8 mm wrench on me, so I went ahead and tightened the bolts and it fired right up.

Does this mean I just need to sand the contacts and replace the bolts (I have a couple in the box), or is this something else? Thanks!


Petro-Canada Duron HP 15W-40 CK-4/SN
99 Explorer: H17W02
00 Pajero: XG9688
01 Grand Marquis: XG2
05 Envoy: XG9837

Motorcraft 5W-50:
18 Mustang GT: XG10575
Re: Group 78 Battery Connector Issues [Re: Falcon_LS] #5245531 10/21/19 12:04 AM
Joined: Apr 2017
Posts: 2,114
D
dogememe Offline
Offline
D
Joined: Apr 2017
Posts: 2,114
I've owned many GM trucks with side post batteries and have changed batteries, ignition switches, and starters, just to find out the problem is bad terminals. Even if it looks ok from the outside taking the bolt and terminal out and inspecting and cleaning everything will probably fix your Envoy.


2010 Ford Escape 2.5 ~101K Miles: Castrol Magnatec 5W-20, Wix Filter.
2001 Chevy Suburban 5.3 ~283K Miles: Unknown Oil, Filter.
Re: Group 78 Battery Connector Issues [Re: Falcon_LS] #5245554 10/21/19 03:38 AM
Joined: Dec 2017
Posts: 5,107
S
Snagglefoot Online Content
Online Content
S
Joined: Dec 2017
Posts: 5,107
Side terminals have to be very tight.( tighter than logical). smile


If you want the job done right......do it yourself.
Re: Group 78 Battery Connector Issues [Re: Falcon_LS] #5245597 10/21/19 05:17 AM
Joined: Aug 2010
Posts: 6,883
K
Kira Offline
Offline
K
Joined: Aug 2010
Posts: 6,883
So, clean, tightened down well AND GREASED with dielectric grease? Just askin'?

Re: Group 78 Battery Connector Issues [Re: Falcon_LS] #5245622 10/21/19 05:44 AM
Joined: Dec 2016
Posts: 9,585
L
Linctex Online Content
Online Content
L
Joined: Dec 2016
Posts: 9,585
Originally Posted by Falcon_LS


Does this mean I just need to sand the contacts and replace the bolts (I have a couple in the box), or is this something else? Thanks!


Yes, that's all you need to do!
It's a pretty common problem on side terminal battery connections.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: Group 78 Battery Connector Issues [Re: Falcon_LS] #5245652 10/21/19 06:28 AM
Joined: Jun 2003
Posts: 34,907
E
eljefino Offline
Offline
E
Joined: Jun 2003
Posts: 34,907
Wiggle the side terminals OUT of the rubber. You may find corrosion that you can clean up.

You want the back side as well as the front side of the cable to be clean. You only get half of it if you don't wiggle the little bolt out.

You can also get a 3/8-16 by 1" bolt, nut, and lock washer to replace the cheezy GM bolt. Assemble the nut and washer up by the head, run this in like a stud, then run the nut down so it compresses the lock washer against the cable. Permanent springiness, it digs in better.

Re: Group 78 Battery Connector Issues [Re: Falcon_LS] #5245702 10/21/19 07:35 AM
Joined: Jan 2015
Posts: 1,409
R
ragtoplvr Offline
Offline
R
Joined: Jan 2015
Posts: 1,409
It seems battery manufacturers have lost the ability to make acid tight connection between the terminal lead and the case plastic. They could do it 20 years ago, but evidently not now. If the battery is leaking I replace it.

Cost reductions rise again. I bet a federal law that the battery company has to repair all the damage their leaking battery causes would fix this right way.

On side terminal I remove and clean the bolt, or replace it, they are pretty inexpensive. I clean both sides of the terminal and baking soda them. Where the mold on the plastic, acid can get in there and ruin the connection and not be visible unless you look close. You may need to replace the cable.

Then everything, bolt, both sides of battery connection, and battery post, not the inside of the threads though get coated in sticky grease. Then I make up the connection, dress remove excess grease and never seem to have problems, unless the crap battery decides to leak again.

Rod

Re: Group 78 Battery Connector Issues [Re: Falcon_LS] #5245738 10/21/19 08:13 AM
Joined: Dec 2013
Posts: 931
L
Lapham3 Offline
Offline
L
Joined: Dec 2013
Posts: 931
I first ran into the side terminals with our new '72 Vega and it was fine, but yes GM was having more recent problems and our '06 Malibu was getting close to the end of using them. I've never had a problem with the terminals or batteries in a number of GM cars in the years between and still have several cars with them.

Re: Group 78 Battery Connector Issues [Re: Falcon_LS] #5245741 10/21/19 08:18 AM
Joined: Jan 2013
Posts: 3,466
W
WyrTwister Offline
Offline
W
Joined: Jan 2013
Posts: 3,466
I have had corrosion get in / under the plastic . Even to the point of damaging the wire under insulation .

I use bicarbonate of soda to neutralize acid , fight the green crusties and clean . Then grease the connections .

If the condition is too bad , replace the cables / terminals .


Wyr
God bless
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™