2nd Gen Non-Engine/Transmission Relaying headlights

[RPalermo]

I want to add relays to the headlight wiring on my 99 Dodge 3500. Can anyone tell me when they went from switched power to switched ground? When I checked power at the headlight harness plug I had 11-12V at pins

A-VT/RD & C-RD/OR on low beam and A-VT/RD & B-VT/WT on high beam. Should it be showing voltage at two of the pins on both low & high beams?

Thanks

Rick.

 

[SSolderitch]

I found my fluke VOM is to good - with ac/+dc & -dc the meter jumps around, etc.

The best for a on/off is one of those $4 lighted ice pick testers. With headlight switch OFF,

switch using hot= first look for ground wire (tester lead on + battery). Then find low & high wire with tester lead on -battery and the headlight switch in on position.

switch using ground= first find hot wire(tester lead on - battery) Then find low & high wire with headlight switch in the on position.

 

[SSolderitch]

I tried to get this link in my last post:



catalog pages 20 & 21



headlight realy without the hassle and not much more $