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04-01-2014, 02:17 PM #1
- Join Date
- Apr 2014
2008 Suburban LTZ that has electrical issues
I purchased a used 2008 Suburban LTZ with 70,xxx miles last year and have had nothing but trouble. Now I'm having issue with the electrical system.
Here is what has happened:
I was pulling a trailer and it started acting weird when I would put on the left turn signal. All of the electronics inside would shut down and then come back on.
Then it started doing it just driving it down the road. When we got to where we were going it was completely dead. I giggle some wires and it came back to life.
After a few weeks of it running just fine, it started up again. doing the same thing. Well this has been going on for some time and I have narrowed it down to one small connection on the ground cable going to the battery. It is 3 or 4 wire connection that is wrapped around the ground. It doesn't look like it has anything to do with the ground.
I've taken it to a couple of different mechanics, but they haven't been able to duplicate the problem.
I found another post on here from May 2011 where somebody else had the same problem, but the end results of what they did to fix it wasn't posted.
1 Anyone seen this before?
2 What in the world is the black plastic thingy on the negative battery cable?
3 Anyone know where to find a wiring diagram for this thing?
4. Does anybody know how to fix this?
04-01-2014, 02:52 PM #2
the black box on the negative cable is a stand alone regulated voltage control. Here is some info about it from one of the manufacturers site:
The "Stand Alone Regulated Voltage Control" (SARVC) uses a "Generator Battery Control Module" to control the alternator set point. The other RVC systems, Generation III and Generation IV, use up to five different computers to operate the entire system and control the alternator regulator set point. There is a default voltage regulator set point built into the regulator. It is set at 13.8 volts. If the system fails at any point the regulator will default to the 13.8 volts and a code will be set.
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