12 Volt Relays Advice - Page 3 - Vintage Mustang Forums
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post #31 of 41 (permalink) Old 03-19-2018, 06:34 AM
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Take another look at the Main head light relay receiving the "in" input or in other words, the direct output from the headlight switch.

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post #32 of 41 (permalink) Old 03-19-2018, 07:30 AM
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I was looking at halogen headlamps at Summit, and someone commented that the H4 type halogen bulbs are wired differently that the old style incandescent bulbs. Anyone know anything about this?

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post #33 of 41 (permalink) Old 03-19-2018, 10:53 AM Thread Starter
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I certainly am no expert the company that manufactured my relays is the largest automotive manufacturer of halogen, led parts & conversion kits in the world packaged under several brand names they may be able to help try their CS.

Amazon also has a conversion kit listed in an earlier post by 1ofmillion.

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post #34 of 41 (permalink) Old 03-19-2018, 12:04 PM
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They should be the same. Just be aware that is if the bulb sockets are are inexpensive replacements you may melt them out over a short period of time.

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post #35 of 41 (permalink) Old 03-19-2018, 12:14 PM
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Quote:
Originally Posted by Bob & Sue View Post
I certainly am no expert the company that manufactured my relays is the largest automotive manufacturer of halogen, led parts & conversion kits in the world packaged under several brand names they may be able to help try their CS.

Amazon also has a conversion kit listed in an earlier post by 1ofmillion.

Blazer-International Vehicle Lighting Products

Phone: 847.478.6295
Email: [email protected]
Monday - Friday, 8 a.m. - 5 p.m. CT

Bob


I wouldn't sweat it. For a future tech or owner to diag it later it may be a little confusing at first. Just keep some spares as they are not real common.
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post #36 of 41 (permalink) Old 03-19-2018, 12:31 PM Thread Starter
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I bought them at Grainger on a business account with a 30% case discount Autozone, Amazon & NAPA also carry them.

This thread has helped I now kind of understand relay theory it sure isn't rocket science.

Thanks for the encouragement.

Bob

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Some previous cars: 68 Shelby GT500 428 Auto, 40 Chev Coupe 283, 47 Fiat Topolino B/A Chev 288 Hilborn, 64 Plymouth 426 Hemi SS/BA, 70 & 71 Cuda & Challenger 426 Hemi SS/AA, 55 Chev 327, 55 Chev Nomad 283, 57 Chev Nomad 327,
57 Pontiac Safari 389, 63 Corvette 327, 68 Cougar XR7 302, 68 Camaro RS/SS 327
69 Camaro Z28 396, 73 Olds Cutlass Supreme 455 4 sp

Last edited by Bob & Sue; 03-19-2018 at 12:43 PM.
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post #37 of 41 (permalink) Old 03-19-2018, 12:40 PM
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How waterproof do you think these relays are? I have the Amazn kit and the relays are far front right of inside fender. I turned the batt tray and have lots of room there. There are also a few air vents there that I think could get pretty wet and i dont wanna be afraid of rain. I was wanting to add a Duraspark box there soon so i might find a small plastic box to put the relays in.
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post #38 of 41 (permalink) Old 05-03-2018, 01:47 PM Thread Starter
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Quote:
Originally Posted by Paul1958 View Post
If your relay has 5 pins it is SPDT. DPDT would have 8 pins. I dont how you can feed two different loads that need to be on at the same time from a SPDT relay using both the NO and NC contacts.

Paul
There is a discussion on this subject on a different forum someone else posted this info. Just thought for anyone reading this thread terminology and type of relays vary.

This is from the Daniel Stern website:

The best relays to use in setting up a headlamp circuit have dual 87 terminals. That lets you use one 87 terminal to power the left filament, and the other 87 terminal to power the right filament in whatever circuit you're building (low beam, high beam, fog lamp, etc.). Note that a terminal labelled 87a is not the same as an 87 terminal.


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69 Coupe 351W C4 Holley Street Avenger Comp Cams Roller Noisy Gear Drive
Cad ATS V
Some previous cars: 68 Shelby GT500 428 Auto, 40 Chev Coupe 283, 47 Fiat Topolino B/A Chev 288 Hilborn, 64 Plymouth 426 Hemi SS/BA, 70 & 71 Cuda & Challenger 426 Hemi SS/AA, 55 Chev 327, 55 Chev Nomad 283, 57 Chev Nomad 327,
57 Pontiac Safari 389, 63 Corvette 327, 68 Cougar XR7 302, 68 Camaro RS/SS 327
69 Camaro Z28 396, 73 Olds Cutlass Supreme 455 4 sp
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post #39 of 41 (permalink) Old 05-03-2018, 02:51 PM
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Quote:
Originally Posted by j persons View Post
I was looking at halogen headlamps at Summit, and someone commented that the H4 type halogen bulbs are wired differently that the old style incandescent bulbs. Anyone know anything about this?
I do not believe that is true, those are sold as plug in devices, that cannot be true if one has to change the position of the terminals in the connector. I have replaced sealed beam headlamps, before the days of halogen sealed beams with Cibie headlamps that used H4 bulbs, they plugged in and worked.
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post #40 of 41 (permalink) Old 05-03-2018, 02:53 PM
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I use separate relays in my kits - that way if a relay fails you still have the 'other' beam.
Of course I use resetting circuit breakers like the factory as well rather than fuses or fusible links like I see many people doing. I think it's better to have your headlights blink if there's a problem rather than just go out completely.
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post #41 of 41 (permalink) Old 05-03-2018, 08:52 PM
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Quote:
Originally Posted by TheRktmn View Post
I use separate relays in my kits - that way if a relay fails you still have the 'other' beam.
Of course I use resetting circuit breakers like the factory as well rather than fuses or fusible links like I see many people doing. I think it's better to have your headlights blink if there's a problem rather than just go out completely.
Yep.


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