These grounding points are used for many different things (see wiring diagrams below), and when they fail they can cause several (and seemingly unrelated) problems, such as a headlight or signal out along with ABS codes, brake light, etc..
A common problem is corrosion that often occurs in and around the eyelet crimp and wire insulation and can be hidden or hard to see:
You can try to check the grounds using a test light (must shine very bright similar to touching the leads of the test light directly together) to test good or as an alternative an Ohm meter set to the lowest resistance, you want to see less than 5 Ohms.
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The fix is cutting the old eyelet off, stripping the wires back to good metal, then adding a new eyelet. Some have also used multiple eyelets or a bus bar strip rather than a single eyelet.
There are several good videos on YouTube, etc. that will give you a good idea of what to expect.
Note: It may be tempting to cut and splice only the ground wire that's faulty to save time, but if one ground wire is corroding it's likely the other ground wires are corroding as well and will fail, so take the time to repair them all properly, and save yourself trouble down the road.
(On G110, the coolant tank can be removed for better access.There's not a lot of wire to work with, so you may need to add wire.)
Wiring Diagrams:
(*Some of the wiring diagrams below are from an older manual, so the noted color codes and wire size may be more accurate for earlier years. On the 2014 (and some other years) wiring diagrams these call outs are G104, G103, G102 (end of this post)).
G110 (G104)
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G111 (G103) & G112 (G102)
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G111 (G103)
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G112 (G102)
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2014 wiring diagram
(Full 2014 wiring diagrams and service manual here)
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Wiring diagrams and other information for 2013 and older Patriots can be found offsite here: Free Service Manuals for Jeep vehicles | Operation CHARM
A common problem is corrosion that often occurs in and around the eyelet crimp and wire insulation and can be hidden or hard to see:
You can try to check the grounds using a test light (must shine very bright similar to touching the leads of the test light directly together) to test good or as an alternative an Ohm meter set to the lowest resistance, you want to see less than 5 Ohms.
The fix is cutting the old eyelet off, stripping the wires back to good metal, then adding a new eyelet. Some have also used multiple eyelets or a bus bar strip rather than a single eyelet.
There are several good videos on YouTube, etc. that will give you a good idea of what to expect.
Note: It may be tempting to cut and splice only the ground wire that's faulty to save time, but if one ground wire is corroding it's likely the other ground wires are corroding as well and will fail, so take the time to repair them all properly, and save yourself trouble down the road.
(On G110, the coolant tank can be removed for better access.There's not a lot of wire to work with, so you may need to add wire.)
Wiring Diagrams:
(*Some of the wiring diagrams below are from an older manual, so the noted color codes and wire size may be more accurate for earlier years. On the 2014 (and some other years) wiring diagrams these call outs are G104, G103, G102 (end of this post)).
G110 (G104)
G111 (G103) & G112 (G102)
G111 (G103)
G112 (G102)
2014 wiring diagram
(Full 2014 wiring diagrams and service manual here)
Wiring diagrams and other information for 2013 and older Patriots can be found offsite here: Free Service Manuals for Jeep vehicles | Operation CHARM
