h4 harness issues
Thread Starter
Seasoned Member
Joined: Jan 2011
Posts: 493
Likes: 0
From: Grand Haven, Michigan
Year: 1999
Model: Cherokee
Engine: 4.0 I6
i didnt know ther was a difference...i will try switching them tonight when i get home to see
Thread Starter
Seasoned Member
Joined: Jan 2011
Posts: 493
Likes: 0
From: Grand Haven, Michigan
Year: 1999
Model: Cherokee
Engine: 4.0 I6
ok guys bought 2 new relays from AA
i installed them and i still have no brights. I took both off, switched them around and got the same results
cleaned all the grounds, but i still cant get my brights to work. Do you think its the harness or the headlight itself?
As mentioned before, the high beams will work once in a while, id say about 10% of the time
any ideas? anything i should do..all the connections are made with die electric grease so i know water and dirt shouldnt be a issue


Help!
i installed them and i still have no brights. I took both off, switched them around and got the same results
cleaned all the grounds, but i still cant get my brights to work. Do you think its the harness or the headlight itself?
As mentioned before, the high beams will work once in a while, id say about 10% of the time
any ideas? anything i should do..all the connections are made with die electric grease so i know water and dirt shouldnt be a issue



Help!
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
ok guys bought 2 new relays from AA
i installed them and i still have no brights. I took both off, switched them around and got the same results
cleaned all the grounds, but i still cant get my brights to work. Do you think its the harness or the headlight itself?
As mentioned before, the high beams will work once in a while, id say about 10% of the time
any ideas? anything i should do..all the connections are made with die electric grease so i know water and dirt shouldnt be a issue


Help!
i installed them and i still have no brights. I took both off, switched them around and got the same results
cleaned all the grounds, but i still cant get my brights to work. Do you think its the harness or the headlight itself?
As mentioned before, the high beams will work once in a while, id say about 10% of the time
any ideas? anything i should do..all the connections are made with die electric grease so i know water and dirt shouldnt be a issue



Help!
Thread Starter
Seasoned Member
Joined: Jan 2011
Posts: 493
Likes: 0
From: Grand Haven, Michigan
Year: 1999
Model: Cherokee
Engine: 4.0 I6
I got to have current going thru, my low beams work. But its my high beams, didnt work with the old relays, still dont work with the new relays
I dont think it can be a ground issue b/c if the grounds were bad i wouldnt have any headlights....right??
I dont think it can be a ground issue b/c if the grounds were bad i wouldnt have any headlights....right??
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Both relays have own grounds from putco harness each relay gets separate power from factory xj plug. check for power going into high beam relay from factory plug .
Thread Starter
Seasoned Member
Joined: Jan 2011
Posts: 493
Likes: 0
From: Grand Haven, Michigan
Year: 1999
Model: Cherokee
Engine: 4.0 I6
but i will take a look tonight
CF Veteran
Joined: Mar 2010
Posts: 47,923
Likes: 38
From: Broward County Fl.
Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Its not the harness its a bad connection . You said they work every once in a while ill bet it at the factory plug.
Not only check for power but make sure all the wire contacts that deal with the hi's are inserted all the way and lock into the connectors. Had such a situation with a brand new vehicle's ignition system yrs back. Tested positive for power but the contact would push back into the connector when plugged in causing an intermittent loss of power.
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Joined: Aug 2011
Posts: 43,971
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From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
CF Veteran
Joined: Dec 2012
Posts: 4,169
Likes: 6
From: York, PA
Year: 1998
Model: Cherokee
Engine: 4.0

Back on topic...I've been using dielectric grease on every darned electrical connector I mess with. Did you do that?
I plan on getting my new harness installed here as soon as I wrap up my disc conversion..
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Beware: if your original connectors are weak and don't "pinch" very well on the female side, dielectric grease is causing you problems. Dielectric grease is an INSULATOR - it is like caulking that never dries. It needs to be applied around the edges like a sealant. Think about it - do you do the edge of your water pump with RTV, or fill the whole unit and then wonder why you're overheating? Why would you do that with an electrical connector?
While you're checking your connectors, do the following
- Take them all apart
- Genty clean them with a brass wire brush and a heptane or hexane contact cleaner. You may have to alternate to remove all corrosion and contaminants
- Use a dental pick on female connectors to end the prongs inward. The idea is to get them to grip onto the male pins better
- Apply a light amount of a conductive electrical grease on either the pin or socket. Examples of these are Gardner Bender OX-GARD and Ideal NOALOX. You can find these at Home Depot, Lowes, etc. (Other products here: http://www.k1ttt.net/technote/antiox.html)
- Apply dielectric grease around the perimeter of the connector. Do not get any on the actual conductor. Remember, its like a gasket.
- Reassemble, wrap with tape if you feel like it.
A multimeter is essential for this type of work. Runs and connectors should read 0.3 ohms or less. When I installed my Putco harness I did the above, my grounds are 0.1 ohm to the battery and well protected from the elements.
While you're checking your connectors, do the following
- Take them all apart
- Genty clean them with a brass wire brush and a heptane or hexane contact cleaner. You may have to alternate to remove all corrosion and contaminants
- Use a dental pick on female connectors to end the prongs inward. The idea is to get them to grip onto the male pins better
- Apply a light amount of a conductive electrical grease on either the pin or socket. Examples of these are Gardner Bender OX-GARD and Ideal NOALOX. You can find these at Home Depot, Lowes, etc. (Other products here: http://www.k1ttt.net/technote/antiox.html)
- Apply dielectric grease around the perimeter of the connector. Do not get any on the actual conductor. Remember, its like a gasket.
- Reassemble, wrap with tape if you feel like it.
A multimeter is essential for this type of work. Runs and connectors should read 0.3 ohms or less. When I installed my Putco harness I did the above, my grounds are 0.1 ohm to the battery and well protected from the elements.
CF Veteran
Joined: Dec 2012
Posts: 4,169
Likes: 6
From: York, PA
Year: 1998
Model: Cherokee
Engine: 4.0
Beware: if your original connectors are weak and don't "pinch" very well on the female side, dielectric grease is causing you problems. Dielectric grease is an INSULATOR - it is like caulking that never dries. It needs to be applied around the edges like a sealant. Think about it - do you do the edge of your water pump with RTV, or fill the whole unit and then wonder why you're overheating? Why would you do that with an electrical connector?
While you're checking your connectors, do the following
- Take them all apart
- Genty clean them with a brass wire brush and a heptane or hexane contact cleaner. You may have to alternate to remove all corrosion and contaminants
- Use a dental pick on female connectors to end the prongs inward. The idea is to get them to grip onto the male pins better
- Apply a light amount of a conductive electrical grease on either the pin or socket. Examples of these are Gardner Bender OX-GARD and Ideal NOALOX. You can find these at Home Depot, Lowes, etc. (Other products here: http://www.k1ttt.net/technote/antiox.html)
- Apply dielectric grease around the perimeter of the connector. Do not get any on the actual conductor. Remember, its like a gasket.
- Reassemble, wrap with tape if you feel like it.
A multimeter is essential for this type of work. Runs and connectors should read 0.3 ohms or less. When I installed my Putco harness I did the above, my grounds are 0.1 ohm to the battery and well protected from the elements.
While you're checking your connectors, do the following
- Take them all apart
- Genty clean them with a brass wire brush and a heptane or hexane contact cleaner. You may have to alternate to remove all corrosion and contaminants
- Use a dental pick on female connectors to end the prongs inward. The idea is to get them to grip onto the male pins better
- Apply a light amount of a conductive electrical grease on either the pin or socket. Examples of these are Gardner Bender OX-GARD and Ideal NOALOX. You can find these at Home Depot, Lowes, etc. (Other products here: http://www.k1ttt.net/technote/antiox.html)
- Apply dielectric grease around the perimeter of the connector. Do not get any on the actual conductor. Remember, its like a gasket.
- Reassemble, wrap with tape if you feel like it.
A multimeter is essential for this type of work. Runs and connectors should read 0.3 ohms or less. When I installed my Putco harness I did the above, my grounds are 0.1 ohm to the battery and well protected from the elements.
I guess I've been lucky so far
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Beware: if your original connectors are weak and don't "pinch" very well on the female side, dielectric grease is causing you problems. Dielectric grease is an INSULATOR - it is like caulking that never dries. It needs to be applied around the edges like a sealant. Think about it - do you do the edge of your water pump with RTV, or fill the whole unit and then wonder why you're overheating? Why would you do that with an electrical connector?
While you're checking your connectors, do the following
- Take them all apart
- Genty clean them with a brass wire brush and a heptane or hexane contact cleaner. You may have to alternate to remove all corrosion and contaminants
- Use a dental pick on female connectors to end the prongs inward. The idea is to get them to grip onto the male pins better
- Apply a light amount of a conductive electrical grease on either the pin or socket. Examples of these are Gardner Bender OX-GARD and Ideal NOALOX. You can find these at Home Depot, Lowes, etc. (Other products here: http://www.k1ttt.net/technote/antiox.html)
- Apply dielectric grease around the perimeter of the connector. Do not get any on the actual conductor. Remember, its like a gasket.
- Reassemble, wrap with tape if you feel like it.
A multimeter is essential for this type of work. Runs and connectors should read 0.3 ohms or less. When I installed my Putco harness I did the above, my grounds are 0.1 ohm to the battery and well protected from the elements.
While you're checking your connectors, do the following
- Take them all apart
- Genty clean them with a brass wire brush and a heptane or hexane contact cleaner. You may have to alternate to remove all corrosion and contaminants
- Use a dental pick on female connectors to end the prongs inward. The idea is to get them to grip onto the male pins better
- Apply a light amount of a conductive electrical grease on either the pin or socket. Examples of these are Gardner Bender OX-GARD and Ideal NOALOX. You can find these at Home Depot, Lowes, etc. (Other products here: http://www.k1ttt.net/technote/antiox.html)
- Apply dielectric grease around the perimeter of the connector. Do not get any on the actual conductor. Remember, its like a gasket.
- Reassemble, wrap with tape if you feel like it.
A multimeter is essential for this type of work. Runs and connectors should read 0.3 ohms or less. When I installed my Putco harness I did the above, my grounds are 0.1 ohm to the battery and well protected from the elements.


