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Re: Short in lighting circuit
clrh2ofrank #1399815 Wed Mar 03 2021 04:28 AM
Joined: Mar 2010
Posts: 305
B
Curmudgeon
I'm glad you guys solved the problem.

Re: Short in lighting circuit
clrh2ofrank #1399853 Wed Mar 03 2021 04:35 PM
Joined: Jan 2019
Posts: 95
C
'Bolter
Hot rod,
thanks. Ordered relays this morning will install as soon as i get them Thanks to everyone for your help. i'll let you know how that goes.

Frank

Re: Short in lighting circuit
clrh2ofrank #1399862 Wed Mar 03 2021 05:39 PM
Joined: Feb 2004
Posts: 22,144
H
'Bolter
I think I've got a circuit diagram stashed away somewhere in the computer memory for those relays. I use the Bosch 60 amp relays instead of 30, to take advantage of the larger diameter wires in the mating plugs, not necessarily because headlights need a relay with that much capacity. Basically, you need to use the high/low beam signal from the dimmer switch to trigger one relay for each beam. It's OK to parallel both headlights through one relay, one for high beam and the other for low. Tap the dash indicator light wire into the downstream connector for the high beam relay. I've also gotten into the habit of running the headlight ground wires back to the frame or engine block, rather than relying on rusty body sheet metal to provide a ground.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Short in lighting circuit
clrh2ofrank #1399878 Wed Mar 03 2021 08:47 PM
Joined: Jan 2019
Posts: 95
C
'Bolter
Do you use separate wires from the battery to the relay or can you put the two relays in parrallel. I plan to mount the relays above the dimmer switch. i was planning on running #8 wire from the battery (or Starter) to the relays. I have already ordered 30 amp relays. They are cheap enough that if you think it is necessary i can order a couple of 60 amp also. Thanks again for you help

Re: Short in lighting circuit
clrh2ofrank #1399896 Wed Mar 03 2021 10:59 PM
Joined: Jan 2019
Posts: 95
C
'Bolter
While waiting for the relays, ti took The truck out and ran with low beams for 25 miles. No cycling. thanks for the help and suggestions.
Frank

Re: Short in lighting circuit
clrh2ofrank #1399918 Thu Mar 04 2021 02:10 AM
Joined: Feb 2004
Posts: 22,144
H
'Bolter
One #8 wire will handle both relays since only one at a time will be working, or even a #10 would be plenty. I always mount the relays on the core support close to the lights and run the big power wire out there. That shortens the circuit from the relay to the light. You can use the original headlight wiring from the dimmer switch to trigger the relays. The only reason I use 60 amp relays is the size of the wires in the socket, but I'm always into "overkill"- - - -that's from my dirt track racing days- - - -"Build it three times as strong as you think it needs to be, and try not to be surprised when it breaks!"
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Short in lighting circuit
clrh2ofrank #1399968 Thu Mar 04 2021 03:53 PM
Joined: Feb 2004
Posts: 22,144
H
'Bolter
The high and low beams of the very bright LED headlight I just put on my Harley are wired through relays, and the "passing lights" on both sides of it have a relay circuit powering them. It's a lot easier to swap a failed relay, if that ever happens, than to replace a beam selector switch with wiring running through the handlebars!
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Short in lighting circuit
clrh2ofrank #1399976 Thu Mar 04 2021 04:41 PM
Joined: Jan 2019
Posts: 95
C
'Bolter
Thanks.
Having spent a career in the Aircraft industry, i'm use to seeing the battles between the structure engineers and the weight engineers. Sometimes it is tough for the project engineer to make the final decision. Thanks for your help.
Frank

Re: Short in lighting circuit
clrh2ofrank #1400075 Fri Mar 05 2021 04:34 AM
Joined: Feb 2004
Posts: 22,144
H
'Bolter
Isn't that called a "Mexican Firing Squad"- - - - -everybody standing in a circle and shooting at each other?
smile
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Short in lighting circuit
clrh2ofrank #1400093 Fri Mar 05 2021 12:40 PM
Joined: Feb 2019
Posts: 1,645
P
AD Addict
Here’s how I wired mine. I used two 60 amp Bosch style relays and located them on the firewall above the hi/low beam switch. I used a 40 amp fused single 10 gauge wire to supply both relays. It works great.

I picked up the 12v supply from the starter lug but you can use the alternator. Either place works, whatever is easier.

Attached Files
Last edited by Phak1; Fri Mar 05 2021 12:51 PM.

Phil

1952 Chevrolet 3100
Project Journals
‘59 235 & hydraulic lifters
“Three on the Tree” & 4:11 torque tube
12v w/ Alternator
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