The headlight wiring was fine when AMC \ Renault designed it in 1978 and the lighting met DOT specs. I know mine brightened right back up to stock when the grounds were serviced ( second thing I do after a fluid flush and change ) Nobody said the relay kits were bad. I think they are a good idea when using headlight hotter than stock or when you have corrosion issues or maybe a person wants to make their switches last for ever.. I know the kit made no difference in my first DD XJ so was money wasted there. The trail rig with landing lights in the front ? Not relays but Ford solenoids to the rescue

 

The harness made a noticeable difference on my 89, and picked up about 1-volt at the headlights with stock bulbs. Then I installed a pair of e-code housings an 55/100 bulbs. I don't get flashed with the sharp cutoff on the low beams, and the high beams are are super bright long distance deer spotters.

 

There! Ah fixed it fer ya!




Ford solenoids are relays.

 

Fixed watt ? I don't see anything.





You know and I know but most people don't. Or won't call them that.

 

My first experience with relays was in my 1937 Dodge with it's 6v system. I used a universal truck headlight relay and it made a HUGE difference! Everybody thought I'd converted to 12v!