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by pass hi-beam fog-lamps interlock

 
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Old 30 Jan 2017, 02:01 am
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Cool by pass hi-beam fog-lamps interlock

This modification involves removing relay 'A' (headlight relay HL) from the interior fuse box, and soldering a jumper between pins A4-A5 on the relay or pins 30-87a .
It will allow the fog lamps to operate while high beams are on.
Also should upgrade number 1 fuse to 30A from 25A, because of increased current in the circuit.

I have wanted to do this for awhile, I just studied the wiring diagrams in order to understand how to do it.
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Old 30 Jan 2017, 08:31 am
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Default Re: by pass hi-beam fog-lamps interlock

Would be wise to hold off until you do the relay mod to the headlights as designed here:
Daniel Stern Lighting Consultancy and Supply

The connector C3 for the interior fuse box is already prone to melting. My headlights, signals, and tail lights all failed at once on the highway because of it. The engineers must have had a brain fart when they did the wiring. The fog lights shutting off with the brights is probably a half ass cost effective way to avoid fixing it the right way, spending a few dollars on relays as mentioned in the link above.
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Old 30 Jan 2017, 11:30 pm
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Default Re: by pass hi-beam fog-lamps interlock

Could be a legal thing as well. I know here in Ontario Canada, it is illegal to have more than four "white" lights facing forward on at a time. That's why the driving lights go out when the high beams are turned on.

Your province / state laws will obviously vary ....

Mark.
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Old 31 Jan 2017, 02:46 am
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Default Re: by pass hi-beam fog-lamps interlock

Fuse size-Wire size-And Load are are related as in if you add load (watts) you also must increase the load carrying capabilities of all items on that circuit.

Or you will burn or melt that circuit...
You may have got away with it 30 years ago, but not in todays design.
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Old 01 Feb 2017, 01:16 am
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Question Re: by pass hi-beam fog-lamps interlock

Quote:
Originally Posted by JoeX View Post
Fuse size-Wire size-And Load are are related as in if you add load (watts) you also must increase the load carrying capabilities of all items on that circuit.

Or you will burn or melt that circuit...
You may have got away with it 30 years ago, but not in todays design.
No, because 12 gauge wire is good for 40 amps in free air, or 23 amps in a confined space (like conduit) . * source electronics pocket handbook

The feed wire to the lighting circuit uses 12 gauge, while the individual lighting circuits are 16 gauge (again, 22A free air, or 13A confined)

total load with 350W of all three circuits on at once, is 24A at 14.5 volts. this current travels on the 12 gauge feed wire. it's more than capable of handling this load. this 12 gauge wire then goes on to supply the 16 gauge low beam, 16 high beam, and 18 gauge fog lamps.

i suggest the naysayers do some actual mathematics before criticizing, like i did, before i even started the job. i'm not a hack, and i know what i'm doing.

i increased the load carrying characteristics by installing a 30amp fuse on that existing wiring, which it is capable of safely handling. why install a 30A fuse when max current will only be 24A ? because the max current expected in a circuit should be 80% of a fuse or breakers' capacity for constant operation.
rockandroller likes this.
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Last edited by _PTGT03; 01 Feb 2017 at 02:37 am.
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Old 01 Feb 2017, 01:58 am
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Default Re: by pass hi-beam fog-lamps interlock

A lot of those 'melting' issues are caused by poor connectors - situations where the wire is OK, but the badly joined, oxidized connectors go all Hi-Z and heat up...
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Old 01 Feb 2017, 02:35 am
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Default Re: by pass hi-beam fog-lamps interlock

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Originally Posted by rockandroller View Post
A lot of those 'melting' issues are caused by poor connectors - situations where the wire is OK, but the badly joined, oxidized connectors go all Hi-Z and heat up...
yes ! I pack the harness connectors for the headlight bulbs with dielectric grease to eliminate oxygen from oxidizing the connector contacts.
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2003 GT M/T in Onyx Green Pearl on Michelin Pilot Sport AS 3 Plus Tires 205/50ZR17. Dark Slate Gray Interior. OEM cargo net, parcel shelf, slush mats and trunk protector, mud flaps, mopar subwoofer. Platinum edition pedals, Neon SX 2.0 steering wheel with black+grey wrapped leather cover. Generic lowering springs, KYB gas shocks, Valeo solid flywheel conversion and clutch kit. Urethane insert engine mounts. Energy suspension full body urethane bushing kit. Chrysler premium front speakers, Jenson 6x9 rears. Boston Audio 4x55W amp. Panasonic head unit with xtenzi bluetooth. 300W AC power inverter. Escort 360max and Escort Shifter ZR4, dual front+rear dash camera. stage 1 blow off valve and syked tune computer . Boost and oil pressure gauges with Turbo-Timer. Needswings 3" exhaust elbow, Electric valve actuated Y-pipe with catalytic converter. To do: coilovers, 2step controller, quaife diff, Air-Fuel Meter
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