08-16-2017, 03:03 PM
Join Date: Aug 2015
Location: Glendale, AZ
LED turn signals turn off when headlights on
Put this in General, as opposed to Samurai specific, as I wasn't sure if this was an issue with the Samurai itself, or something to do with adding LEDs to any vehicle.
Adding LED turn signals in to a '87 Samurai. Already switched out the factory relay for an LED compatible electronic unit, so I don't have the rapid flashing issue. These are also complete replacement units, not just adding LED bulbs to the factory housings.
At first I tried to just connect straight to factory plugs, and they didn't work at all. Eventually figured out that if I provide power via the factory turn signal connector, and ground direct to the battery, the turn signal operates correctly.
BUT, if I switch the headlights on, turn signal goes off completely. The rear factory turn signals continue to operate correctly, headlights on or off. I thought it might have something to do with Suzuki's switched ground set up, but after looking at the wiring diagrams, it appears that the turn signals are switching the power.
I'm stumped here. Would this be indicative of a bad ground? I did notice that the turn signal LEDs were considerably dimmer once I grounded to the body instead of direct to battery, so I was planning on adding additional ground jumpers to the body and frame, but even with an additional jumper to battery, the situation didn't improve.
1987 Samurai - SOA, 31s, 2.0L swap, ZOR bumpers/cradle, 6.5 t-case gears - rock crawler
1990 Ford F350 CCLB DRW 4x4 7.3L Banks turbo - tow pig
1959 International B-162 - future heavy hauler
1986 Chevy K5 - 489/4L80E/35s