Electrical problem in lights

[ed455]

Just rewired the truck with an EZ wiring harness. I did a lot of changes simultaneously. Van column, new harness, new lights, etc., so I don't know the extent of any pre-existing electrical gremlins.

So far the only problem I have encountered is in the lights. With the headlights and parking lights off, the brake lights and turn signals work great. With the headlights and/or parking lights on I'm getting some current backfeed throught the system when the RIGHT side turn signal is on. Symptoms:

1. the turn signal indicator on the dash blinks but does so slowly and the indicator (led) never goes completely out.

2. The rear RIGHT SIDE turn signal goes COMPLETELY out when blinking and does so in OPPOSITE sync with the front (which acts normal).

3. I get some dim flashing of the LEFT rear signal when the right trun signal is on WITH the parking and/or headlights.

The left front and rear parking lights connect to the headlight switch at two different pins according to the EZ Wiring diagram. With the RIGHT turn signal going and the parking lights on, I can unplug the rear parking light wire from the headlight switch and the dash indicator acts the way it is supposed to, but there is still dim flashing of both the rear tail lights.

I have checked for good ground, seems to be OK.

My thoughts: bad headlight switch (original) OR bad turn signal switch.