Electrical problems after switching to LED dash lites

Hey guys
1978 GTS US
After changing the dash lights I decided to test them prior to reinstalling the dash and came up with this problem.
When I turned the key on none of the warning lights came on. (Gen, Oil, E-brake). Also the Hazard flashers no longer work. So I started the engine to make sure it would start and the gauges worked. It started OK and they did, however when I turned the key off the engine didn't stop!!! I had to pull the coil wires to get it to stop. After shutting off there was no voltage to the coils. (sounds like a relay?)

Things that work.
Head lights, tail lights and running lights.
Turn indicators including little arrows in speedometer.
All night time dash lights with and without the dimmer.
AC
rear window defogger.
Starter and ignition even though the engine won't shut off after started.
Tach
Gas Gauge.
Oil Gauge but not low pressure warning light.
Water temp gauge.
Oil temp gauge..
The fasten seat belt light flashes once after about 5 seconds. I'm not sure it ever worked. I have jumper in the fuel pump drivers seat safety circuit so the fuel pump runs all the time when the key is on. I use it as a anti-theft device by removing the jumper when I'm not in the car.

Everything was working fine 3 days ago before I changed the dash lights which by the way look great.

I can't find anything wrong. I checked the fuses and all are OK. I unplugged and plugged the dash connectors with no change even though I don't think the dash connectors would cause the Gen light not to come on when the key is turned on with the engine off.

The engine not shutting off is really weird but is mentioned in other threads but without all the other problems.
I checked the hazard switch and there is no voltage going to it which has to be wrong since it works if the key is on or not.

I checked the hazard flasher relay (H) for loose connections and all looked OK.

Tomorrow when it cools off, its over 100 degrees f in the garage, off I'm going to run power to the hazard switch and see if that fixes it as a test. I'll also try putting the old bulbs back in but I can't believe that's the problem.

Seems like it has to be something I inadvertently unplugged but I sure can't find it.

Any help or ideas would be appreciated.

Thanks in advance

Barry

 

The turn indicators work fine. I didn't change the bulbs on the turn indicator lights on the outside of the car just the bulbs for the arrow indicators on the Speedometer so the resistance won't have changed much. I don't, however hear a clicking from the flasher unit, the one on the right side of the relay panel. If your talking about the emergency flasher (H) to the left of the fuse panels, no I didn't change it and also don't hear any clicking from it. I don't recall it being mentioned in any of the write ups. I will put the old bulbs back in tomorrow to see if that fixes it.

Thanks

 

lm2504me

The headlights were not on. Did you have the attendant problems with the hazard flasher and other dash lights? When I first noticed the light problem was the 1st test I did when I had only changed the ba9 (big) bulbs but not the T5 (small) bulbs. Did your turn indicators work prior to installing the LED flasher?

Thanks
Barry

 

Three prong.

 

Mike
Yep that's what I thought, that I disconnected something or shorted something out but I've been through is a dozen times and can't find anything. I'm going to put the stock bulbs back in it this morning to see if that's the problem. Really frustrating.

Barry

 

Andretti
Yeah I just bought some cheap LEDs off the internet. No polarity and the extra diode on top. As I told Mike I'm going to start putting the stock bulbs back and hope that fixes it.

Barry

 

Johnny
Tried Rheostat both ways no difference. I cleaned it well and made some minor adjustments to the wiper and it works great with the LEDs. The relay's are always an option but they are all original and I've never had any problem with them. I'm wondering if there just isn't enough load on the emergency flasher (H) as the hazard circuit seems to play a major roll in the electrics of everything. I was hoping someone could say "O yeah. Just change this widget or plug that back in" but no such luck. If switching back to the original bulbs doesn't fix it I'll start jumpering stuff in order to get a better handle on this. I've already jumpered power to the various lights that don't work (from the fuse panels) and all looks good.

Wondering if someone could tell me where the primary power for the hazard switch is located. I don't have Paul's schematics so its difficult to tell with the low quality internet stuff.

Barry

 

Changing back to the incandescent bulbs for the warning lights fixed everything. Left the LEDs in to illuminate the gauges. Guess there wasn't enough resistance in the warning LEDs to trigger the relays or something. Probably has to do with the way the hazard circuit is integrated with everything.

Thanks for your help
Barry