 H4 headlight relay question |
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| SKL1 |
 Jul 3 2014, 01:22 PM
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Senior Member  Group: Members Posts: 1,685 Joined: 19-February 11 From: north Scottsdale Member No.: 12,732 Region Association: Upper MidWest 
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Putting in new H4 headlights with the 100W high beam and utilizing the "relay" to protect the OEM wiring.
Using the relay and new lights from Pelican and have checked and rechecked my wiring several times. Fused power from battery to #30. #85 to ground. #87 to high beam terminal of each light, #86 to old headlight wiring on one side, and taped off the other as recommended. I have 12V into relay when high beams are on, and good 12V from battery, but neither high beam works thru the system, though low beams work. Fuses all good- new JWest fuse panel. Bulbs new and work fine when bench tested. Any ideas???? Have 2 new relays from Pelican and have tried both... ('73 2.0) |
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| ClayPerrine |
Jul 3 2014, 02:47 PM
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Life's been good to me so far..... Group: Admin Posts: 16,315 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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That is a good diagram, with one flaw.
The original ground wires for the headlights are of a too small gauge to prevent voltage drop with the bright bulbs. Use a new ground of a larger gauge from the bulbs to the ground points next to the headlight motors. |
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Posts in this topic
SKL1 H4 headlight relay question Jul 3 2014, 01:22 PM
Cap'n Krusty You need one relay for the low beam, one for the h... Jul 3 2014, 01:32 PM ClayPerrine :agree:
For one side you will need two relays, ... Jul 3 2014, 01:47 PM Luke M I found this drawing awhile back.
Hope it helps. Jul 3 2014, 02:31 PM SKL1 great suggestions guys!!
another project ... Jul 3 2014, 02:56 PM Dave_Darling You don't have to have relays for the low beam... Jul 3 2014, 02:57 PM Drums66 .....Low watt H-4's,,,,no relay's(I have n... Jul 4 2014, 01:24 PM
SKL1 This car will spend its life in AZ- it is VERY da... Jul 4 2014, 02:40 PM |
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