Trouble bypassing Guide Matic

[Sean O'Hare]

Hi all, newbie here.  Great forum!

I have 64 Series 62 I just got and trying to fix a few minor things.  The headlights are stuck on high beam, no matter what I do with the dimmer switch and guide matic knob.  I read it can be bypassed, so I followed the instructions from a previous post.

I routed wires from the 3-prong connector from the firewall relay directly to the dimmer switch.  Now I have no lights.  I made sure the connections were clean.  I even swapped the bottom 2 prongs left to right to see if that made a difference.  What am I missing here?

Do I need to do something with the 2-prong connector on the relay?  I notice there is a gray wire there, and also a gray wire on the original 3-prong connector to the dimmer.  Does this gray wire need to be routed to the dimmer?

I hooked it back up the way it was, and works again, but only on High beam.  

[Sean O'Hare]

Also, is the red wire that connects to the right side of the dimmer switch supposed to have 12v power?  I'm not getting any voltage with a test light, with the headlight switch on or off.  Also no power coming from the terminal on the dimmer switch the red wire connects to.

I don't see a red wire coming off of the dimmer switch on the wiring diagram, so I'm stumped.  

[Sean O'Hare]

Well it turns out I also had a bad dimmer switch.  Sure looked original to me.  I put in a standard 61-79 GM switch and now the lights work as normal.

[Russ Austin]

Is the bad dimmer switch an Guide matic switch that has the extra post?  if so, I'd like to get it from you.

[Russ Austin]

You can disconnect the guide matic system if you want to. Just take the 3 pin connector off of the relay and route it to the dimmer switch. Plug it into the dimmer switch.