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Old 09-04-2007, 03:18 PM
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1 dim headlight

about a week ago i put in new sylvania halogens on my 70 elky. i wired up new headlight connections as well. everything works but when i turn on the brights the low beam on the passenger side goes dim. i checked the ground, connections and wires its all good. i dont have any over heating of wires (that i can see or smell). im thinking its due to them using more power and since the passenger side is run off the driver side after the splitting of power its just not enough for the low bean to stay fully lit. but im not sure. would a relay be in need here???

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Old 09-04-2007, 04:46 PM
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Check your grounds..........most likely got a loose one that causes a voltage drop under higher current.
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Old 09-04-2007, 05:33 PM
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happened to me, on my Falcon. couldn't figure it out. the ground for the drivers side was grounded on the volt regulator, which I replaced, and left that ground loose, tightened it, and it went bright
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Old 09-04-2007, 05:58 PM
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Doc here,


If your grounds check out, check to be sure the High Tab on the right lamp is the same as the high tab on the left side..you'll need a jumper to test with..you may have a "Left High" and a Right Low" connected..

It will also be present in High beam..just the reverse..

IF not already, you should run relays and 10 gauge wires for this upgrade.




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Old 09-04-2007, 11:33 PM
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the grounds are as good as they can get. and it is wired the same as it was before i messed with anything i double and triple checked that. i have the correct lights i know this because i still have the boxes they came in. i kept them on the off chance i did happen to buy the wrong light. i was reading in the knowledge base that relays are a very good idea for this upgrade. i was wondering if i could do a bit of custom work with this. if i was to install relays for the headlights could i run 2 toggle switches??? one for the low beam and a second for the high or one toggle switch that works them both??? i ask this because im going for a totally custom look inside ive got a plane for the dash and thats in the works right now. so is in possible to run the lights off of toggle switch(es) by way of the relays???
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Old 09-05-2007, 06:15 AM
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Might check this
Years ago when I replaced a lamp on my 79 chev 1/2, took a while to figure out why it was dim.
Still a relatively new truck, so I was pretty sure it was not a ground or wiring issue with the body.

Seems the original lamps had longer 'nipples' where the electrical tabs were mounted on the original lamps. The new lamps had shorter ones.
This was just enough to keep the lamp connector from seating all the way onto the lamp.

The connector had a shroud that covered part of the lamp on the back, and I ended up having to trim the shroud to get the connector to go on all the way.

other than that---bad ground

If I am not mistaken----the lamps on each side of that car have separate grounds---could be screwed to either side of the core support.

Bryan
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Old 09-05-2007, 10:30 AM
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Quote:
Originally Posted by Bryan59EC
Might check this
Years ago when I replaced a lamp on my 79 chev 1/2, took a while to figure out why it was dim.
Still a relatively new truck, so I was pretty sure it was not a ground or wiring issue with the body.

Seems the original lamps had longer 'nipples' where the electrical tabs were mounted on the original lamps. The new lamps had shorter ones.
This was just enough to keep the lamp connector from seating all the way onto the lamp.

The connector had a shroud that covered part of the lamp on the back, and I ended up having to trim the shroud to get the connector to go on all the way.

other than that---bad ground

If I am not mistaken----the lamps on each side of that car have separate grounds---could be screwed to either side of the core support.

Bryan
ill have to look at the connection it just might not be connected all the way coz i had that problem but i tried to make sure they are all on good.

but the passenger low beam only goes dim when the high beams are on. the highs are fully lit and the drivers low is fully lit its just the passenger low beam is dim with the highs on. when the highs are off its fully lit.


and this is a 4 headlight system just to let you know if you didnt already
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