Question about American AutoWire Headlight Relay Kit - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Already Gone** · 10-07-2023, 07:31 PM

I bought the American Autowire Headlight relay upgrade kit ( # 500403 ) and wonder if anyone else has installed one of these where did u mount the relays.

truckster · 10-07-2023, 08:19 PM

I built my own but I mounted the relays next to the battery.

**Warrens69GMC** · 10-07-2023, 08:21 PM

Mounted the one from LMC, relays next to battery.

**Already Gone** · 10-07-2023, 08:39 PM

Thats what I was thinking, by the battery.

**PDXk5** · 10-08-2023, 01:06 AM

I did the same. Here is a pic of where I mounted my relays

**Palf70Step** · 10-08-2023, 06:58 AM

I used different kit, but mounted the relays and fues near battery

**PbFut** · 10-08-2023, 10:07 AM

If you are still using the factory battery meter connecting the power source of the headlight to the battery or fuse link block will trick the meter into a charging display. The source of power for the lights needs to be on the other end of the shunt wire. Look at your meter with headlights on and alternator not turning. You should display a discharge. If you have connected to the battery side of the shunt, you will show a charging state rendering the meter worthless when headlights are on.

**Already Gone** · 05-07-2025, 10:34 PM

Quote:

Originally Posted by PbFut

If you are still using the factory battery meter connecting the power source of the headlight to the battery or fuse link block will trick the meter into a charging display. The source of power for the lights needs to be on the other end of the shunt wire. Look at your meter with headlights on and alternator not turning. You should display a discharge. If you have connected to the battery side of the shunt, you will show a charging state rendering the meter worthless when headlights are on.

I'm getting ready to do the install and I have the Amercan Autowire Voltmeter # 51087 on the truck already. https://americanautowire.com/product...1&_ss=e&_v=1.0

**Rust_never_sleeps** · 05-08-2025, 01:09 AM

I installed self-resetting breakers after reading a few threads on this site about headlight kits…….they also went on the inner fender ;-)

RichardJ · 05-08-2025, 11:17 AM

I have mine on the driver side fender.
The wires from the dimmer switch-to-headlights pass by, under the lip of the fender.
All connections are made with male/female connectors that match up so that the relays can be disconnected and the original wires can be plugged back into each other as they were originally.
Other than the relay pigtails, the only length of wire added was the 12V source.

**Already Gone** · 05-08-2025, 12:16 PM

Quote:

Originally Posted by Rust_never_sleeps

I installed self-resetting breakers after reading a few threads on this site about headlight kits…….they also went on the inner fender ;-)

Yes good idea, I have one of those to install too.

**G-749** · 05-09-2025, 08:25 PM

71 C 50 292 4sp vacuum operated 2sp rear axle. Userd the LMC headlight relay kit . Long stretch from headlight to headlight, didn't have enough length to mount relay on inner fenders so I had to put them forward of the radiator support and behind the grill , can't see them at all unless you are looking for them. Huge improvement for all the lights . Wasn't sure would fit C 50. Good luck on all your projects.

10-07-2023, 07:31 PM	#1
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,231	Question about American AutoWire Headlight Relay Kit I bought the American Autowire Headlight relay upgrade kit ( # 500403 ) and wonder if anyone else has installed one of these where did u mount the relays. Attached Images __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " In the end, we only regret the chances we didnt take " " Time is the only currency we spend without knowing the balance, use it wisely ." ..

10-07-2023, 08:19 PM	#2
truckster Registered User Join Date: Jan 2001 Location: Orem, Utah Posts: 8,266	Re: Question about American AutoWire Headlight Relay Kit I built my own but I mounted the relays next to the battery. __________________ I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson 1972 K/5 Blazer CST 4WD 1963 Corvair Monza Spyder Turbo convertible 1995 Camaro Z/28

10-07-2023, 08:21 PM	#3
Warrens69GMC Registered User Join Date: Jan 2003 Location: Safford,AZ Posts: 3,636	Re: Question about American AutoWire Headlight Relay Kit Mounted the one from LMC, relays next to battery. __________________ 1969 307, t350 1950 Chevy Wagon 1978 Big 10 1967 C10, 250,3-OTT

10-07-2023, 08:39 PM	#4
Already Gone 70+ ( Old Skool Club ) Join Date: Nov 2003 Location: Saskatoon, Saskatchewan ,Canada Posts: 9,231	Re: Question about American AutoWire Headlight Relay Kit Thats what I was thinking, by the battery. __________________ 1972 C10 Custom/Deluxe 613 Highlander 406/700R4 1999 White Tahoe LS 4x2 with Z56 Police Package 1992 K1500 GMC Suburban Members I have personally met: MusicMan70 - HeavyD - ChewyChevy67 - StingRay -71SWB4x4 - 67 Burb - DeadheadNM - too much stuff - bc65 - das601 " In the end, we only regret the chances we didnt take " " Time is the only currency we spend without knowing the balance, use it wisely ." ..

10-08-2023, 01:06 AM	#5
PDXk5 Senior Member Join Date: Aug 2012 Location: Portland, OR Posts: 962	Re: Question about American AutoWire Headlight Relay Kit I did the same. Here is a pic of where I mounted my relays Attached Images

10-08-2023, 06:58 AM	#6
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 48,486	Re: Question about American AutoWire Headlight Relay Kit I used different kit, but mounted the relays and fues near battery Attached Images __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

10-08-2023, 10:07 AM	#7
PbFut Senior Member Join Date: Feb 2022 Location: Ca Posts: 1,026	Re: Question about American AutoWire Headlight Relay Kit If you are still using the factory battery meter connecting the power source of the headlight to the battery or fuse link block will trick the meter into a charging display. The source of power for the lights needs to be on the other end of the shunt wire. Look at your meter with headlights on and alternator not turning. You should display a discharge. If you have connected to the battery side of the shunt, you will show a charging state rendering the meter worthless when headlights are on.

05-08-2025, 01:09 AM	#9
Rust_never_sleeps Senior Member Join Date: Jun 2022 Location: San Ramon,CA Posts: 1,071	Re: Question about American AutoWire Headlight Relay Kit I installed self-resetting breakers after reading a few threads on this site about headlight kits…….they also went on the inner fender ;-) __________________ 1970 C10 Custom longbed 350/350 “Carburetors are forgiving, timing is not” — Thunderhead289

05-08-2025, 11:17 AM	#10
RichardJ Registered User Join Date: Apr 2010 Location: So Cal Posts: 1,557	Re: Question about American AutoWire Headlight Relay Kit I have mine on the driver side fender. The wires from the dimmer switch-to-headlights pass by, under the lip of the fender. All connections are made with male/female connectors that match up so that the relays can be disconnected and the original wires can be plugged back into each other as they were originally. Other than the relay pigtails, the only length of wire added was the 12V source. Attached Images __________________ '67 GMC 2500, 292, 4spd, AC

05-09-2025, 08:25 PM	#12
G-749 Active Member Join Date: Oct 2023 Location: Fountain Inn SC Posts: 128	Re: Question about American AutoWire Headlight Relay Kit 71 C 50 292 4sp vacuum operated 2sp rear axle. Userd the LMC headlight relay kit . Long stretch from headlight to headlight, didn't have enough length to mount relay on inner fenders so I had to put them forward of the radiator support and behind the grill , can't see them at all unless you are looking for them. Huge improvement for all the lights . Wasn't sure would fit C 50. Good luck on all your projects. __________________ 70 C 20 Longhorn PS , PDB, Dealer installed AC, 700 R4, Dual battery, original TAX 350 motor, 3rd owner truck. 71 C 50 292 4sp 2sp vacuum operated rear end 8 x 12 flat bed. 22.5 Goodyear radial$ n Wheels Now rim$ 86 Grand Wagoneer " Saggy Waggy " Jeep = Just Empty Every Pocket $$$ currently in another shop



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