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Old 01-09-2012, 04:11 AM   #1
nrb's70gmc
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Join Date: Sep 2008
Location: magalia,ca
Posts: 366
lmc HD headlight harness gmc/4 lights

Hi everyone, i got 4 new h4 style headlights and a lmc hd headlight harness for my 1970 gmc for x mas.

i plugged the lmc 3 prong/male harness into the factory headlight low/high harness/plug nearest battery (as directed)


the factory headlight harness had the 3 prong/female light plugs on the outside low/high then the 2 prong/female high only to the inner lights.

so thats how i ran the HD harness.
I plugged the new h4 headllights in and the inner lights were on (for low) then the outer lights came on for high (opposite of factory) i cant figure out whats wrong. im really confused

---------------------------------on a side note--------------

the h4 lights that came with the new housings are all low/high 3 prong
(my mistake on x mas list)

when i tested the headlights (mentioned above) the inner lights were on low- but the outside lights were a very dim yellow.

when i clicked on high beams the outer lights came on but then the inner lights dimmed to a faint yellow.

i know i need to buy 2 H1 bulbs now.
i just dont know why the 2 prong inner lights came on (low beam)

i disconnected the HD harness and plugged original lights back in and they worked normal. 2 outer low beams on--- 4 on high beam.
__________________
1970 2wd 3/4 ton- 2004 crate 350 thorley tri-y headers-edelbrock performer eps manifold 600cfm performer carb, crane cams energizer cam,lifters, dual 2.5 magnaflows, mallory HEI, powermaster 140 amp altenator, griffen aluminum radiator.(8 MPG)

Last edited by nrb's70gmc; 01-09-2012 at 04:30 AM.
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