Kennedy Headlamp Harness Kit

[City_Slicker]

I read a previous thread that stated I could get the above to run 4 headlamps at once. I am trying to get all the lights working on the nose at all times, has anyone else done this and how??

[TxDoc]

There is the Kennedy, the R&D, and the Painless Wiring kit

 

I have the Kennedy, mainly due to the heavy-duty wiring harness and relays. Kennedy Diesel  and go to truck accessories.

 

Painless kit

30821

1999 AND LATER GMC/CHEVY TRUCKS

 

HIGH BEAM  HEADLIGHT RELAY

Like our best selling relay kit for the 1988-98 GM pickups and SUVs, this new kit from Painless will improve the visibility and increase lighting spread pattern by keeping all four headlights on when high beams are engaged.

 

*Note: For all 1999 and later GM trucks including trucks with low beam daytime running lights. Some 99 and later trucks wiring did not change. If your headlight wires are Tan and Green, use Kit# 30802; if Purple and Yellow, use Kit# 30821.

30802

1988-98 GMC/CHEVY TRUCKS  

 

 

HIGH BEAM HEADLIGHT RELAY

Since the 4-headlight system was introduced in 1988 on GM pickups and Suburbans, owners of these vehicles have wondered why their low beams go off when the high beams are turned on? No good reason we can think of. Increase the intensity and improve the spread pattern by keeping all four lights on when in high beam mode. Easy 10 minute installation.

 

*Note: For all 1988-98 GM trucks including trucks with low beam daytime running lights. Slight modifications may be necessary for some vehicles such as 88-91 Suburbans.

 

R&D info/installation R&D mainpage

 

Some further info on the Kennedy headlight harness:

 

from mdrag:

 

Finished installing and testing the Kennedy Diesel harness with 4 lamp high beams. Pics of the install:

www.picturetrail.com/gallery/view?p=999&gid=508648&uid=157168&members=1

 

I measured the voltage at the headlight connectors with the lights on by piercing the insulation close to the connector. The OEM and KD harness were tested with the stock bulbs and 70W LB/100W HB Phillips Halogen bulbs provide by Kennedy.

 

Voltage readings were obtained using a Fluke model 77 digital multimeter and compared to battery/alternator voltage after the system voltage stabilized. I also made measurements at factory idle speed and using the high idle mod speed of ~850 RPM (no difference).

 

The results were similar for the OEM bulbs or the 70W/100W bulbs. The OEM 4 lamp voltages were obtained using the modification posted on previous threads - that link for the 4 lamp mod no longer works. I removed that 4 lamp mod for testing of the KD harness and used the diode provided with Kennedy's kit for 4 lamp measurements.

 

Battery voltage measured approx 14.5V during the readings, but would fluctuate slightly and the actual voltage was recorded and used. Here are the numbers for the 70W/100W Phillips Halogen bulbs:

 

OEM Harness LB 0.6V drop max

KD Harness LB 0.3V drop max

 

OEM Harness 4 lamp 0.6V max drop LB bulb

1.2V max drop HB bulb

KD Harness 4 lamp 0.3V max drop LB bulb

0.3V max drop HB bulb

 

The Kennedy harness cut the LB voltage drop in half. The improvement was more dramatic in the HB 4 lamp mode with the LB bulb voltage loss decreased by 50% and the HB bulb voltage loss diminished by a factor of FOUR (400%) using the KD harness.

 

These numbers confirm what I see when using the headlights. There is NO dimming of the LB bulb(s) with 4 lamp operation. Whether you opt to use the higher wattage bulbs or the OEM bulbs - YOU WILL SEE AN IMPROVEMENT in your headlight illumination.

 

The harness has individual 12V power and ground leads for the DS and PS, along with heavy duty weather-proof relays (2). Heavy gauge wire is used throughout with first rate weather pak connectors. A removable diode converts the harness from 2 lamp HB to 4 lamp HB use. The harness is covered with split loom.

 

JK told me the harness kit fits 1990 to present with composite lamps. Kits available for most other models as well.

 

and he added:

 

The voltages I posted above were for the 70/100W Phillips bulbs used in the OEM and KD harness.

 

The voltages for the OEM bulbs in the OEM and Kennedy's harness were for all practical purposes the same +/- 0.1V. I also did the measurements at the factory idle speed and using the high idle speed of ~850 RPM for the various configurations - again with the same results - that is for all practical purposes the voltage differences I posted above were the same. I have TWO Fluke model 77 digital multimeters and periodically checked the measurements with each meter....

 

 

Good luck with your mod, you will love it.  

 

btw--consider the Sylvania Siverstars

for $25 and a possible rebate of $10, you will be very close to HID temps. Very white and bright light results, with a low cost to replace if damaged.

 

SilverStar's color temperature is a white hot 4,000° K, for higher than other halogens on the road and comparable to High Intensity Discharge headlights/

[City_Slicker]

Thats what I needed! Thanks!  

[RoadRage66]

The only thing I might add is when you install the item do your self a favor to prevent problems down the road. Do not use the Scotch Lock wiretaps that come in the R&D kit. I have installed equipment into vehicles all over the world and those #### wire splices have come back to haunt us. I would highly suggest soldering the wires and using heat shrink to seal out the elements. Just a note from my past experience.