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Discussion Starter · #1 ·
Hey guys,

So I am not sure if anyone else has this problem, but when I am driving and I start to slows down to a store my head lights dim when my transmission shift down (A/T). At first it didnt bother me but now since I have noticed it, it is annoying. Although the dimming in not super dangerious but I am worried there might be a bigger issue. Ideas?

2009 Automatic Santa Fe
 

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Discussion Starter · #2 ·
I found this does anyone know if the MFG warrenty would cover this?

There is a Hyundai bulletin about ground loss:



Technical Service
Bulletin
Subject
Group
Number
Date
Model
CIRCULATE TO: [ ] GENERAL MANAGER
[X] SERVICE ADVISOR [X] SERVICE MANAGER [X] WARRANTY MGR [ ] SALES MANAGER
[X] PARTS MANAGER [X] TECHNICIAN
ELECTRICAL
08-BE-004
JUNE, 2008
ALL
DIAGNOSIS VOLTAGE DROP
DESCRIPTION:
Excessive resistance in high amperage circuits may result in one or more of the
following symptoms:
• Blower motor speed slow down and the radio cycles off and on.
• Intermittent headlight dimming during deceleration.
This bulletin provides the procedure to diagnose and repair the vehicle wiring grounds.
SERVICE PROCEDURE:
1. Start vehicle and turn on headlights (including high beam), air conditioning, and set
the blower to maximum speed.
2. Using a known good digital volt-ohm meter (DVOM), perform a voltage drop test on
the positive battery cable, paying particular attention to the leads to the Engine
Room Junction Box (refer to photo on page 2). If the voltage drop is more than 0.2
volts on any of the leads, replace the Positive Battery Cable.


POSITIVE BATTERY CABLE TEST CONFIGURATION
3. Perform voltage drop test on the negative battery cable. If the voltage drop is more
than 0.2 volts, repair or replace the negative battery cable.
NEGATIVE BATTERY CABLE TEST CONFIGURATION


Technical Service
Bulletin
Group
Number
4. Perform voltage drop check to all body ground locations in the engine compartment.
Check with the positive volt meter lead on the negative battery terminal and the
negative lead to the ground locations. If the voltage drop is more than 0.2 volts,
repair or replace the body ground terminal and/or wiring assembly.
08-BE-004
ELECTRICAL


5. Perform voltage drop check to all Engine and Transmission ground straps. Check
with the voltmeter positive lead on one end of the strap and the negative lead to the
opposite end. If the voltage drop is more than 0.2 volts, repair or replace the
ground terminal and/or ground strap.
NOTE: When repairing grounds, chase the bolt threads with appropriate tool,
clean the harness terminal and apply a star washer between the bolt and
the terminal eyelet. Do not sand or grind paint from the body.
WARRANTY INFORMATION:
Normal warranty operation code and times apply.


"Do not sand or grind paint from the body."

This is for preventing formation of rust at that spot.
It will compromise the joint in the long term.
So do it as mentioned, with star washers.

You'll need a voltmeter to check.
There are several ground straps, but I don't know where all are.
It does'nt make much difference where to put straps to the chassis/body.
Only battery ground wire and alternator housing will draw amps to compromise grounding straps.
Battery grounds to chassis, alternator to the engine.
You could measure between engine metal and chassis metal at running engine and head lamps on, aircon on etc., high electric load. It should not read above 0.2 volts/200 millivolts.
Or do as Wiley does, simply take strong copper wires, the thickest as possible, not even need isolated ones, join them together in parallel, to form a single wire and bolt them with strong bolts in between engine block and chassis, somewhere in the middle..
 
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