Hi Folks,
I am at the end of my knowledge here and looking for some help?
I have a 95 mkviii engine/trans in my 46 ford. It uses all the factory wiring (modified to fit) and a factory cruise control setup. This has been working perfectly for going on 8 years. In early october I installed some led taillights and left on vacation with it shortly afterward. Soon as I got on the freeway and hit the cruise control it wouldn't engage and I noticed the convertor would not lockup.
During the 2 week trip I poked around trying to troubleshoot it and found I had some voltage on the brake light circuit. With the key on there was about 8 volts and with engine running almost battery voltage 11.5 or so. I finally discovered that if I installed a std tail light bulb on the brake light circuit it was enough load to absorb the stray voltage and the convertor would lock up
normally. Still no cruise though.
When I got home (2000 miles later) I went through all the grounds (good) the brake light switch (waterproof industrial limit switch) changed the cruise module, tested for correct ohms and volts to it. Finally discovered the voltage was coming [out]of the ecm on the pin that cancels the convertor lockup. I changed the ecm and it's (voltage) still coming out the same pin. This pin is supposed to receive a signal [from] the brake light switch)
Reinstalled the std tail lights, no change. Ran a scanner (high dollar snap on) no codes, no problems showing up. No cruise!
Any ideas??
Thanls, Dave
I am at the end of my knowledge here and looking for some help?
I have a 95 mkviii engine/trans in my 46 ford. It uses all the factory wiring (modified to fit) and a factory cruise control setup. This has been working perfectly for going on 8 years. In early october I installed some led taillights and left on vacation with it shortly afterward. Soon as I got on the freeway and hit the cruise control it wouldn't engage and I noticed the convertor would not lockup.
During the 2 week trip I poked around trying to troubleshoot it and found I had some voltage on the brake light circuit. With the key on there was about 8 volts and with engine running almost battery voltage 11.5 or so. I finally discovered that if I installed a std tail light bulb on the brake light circuit it was enough load to absorb the stray voltage and the convertor would lock up
normally. Still no cruise though.
When I got home (2000 miles later) I went through all the grounds (good) the brake light switch (waterproof industrial limit switch) changed the cruise module, tested for correct ohms and volts to it. Finally discovered the voltage was coming [out]of the ecm on the pin that cancels the convertor lockup. I changed the ecm and it's (voltage) still coming out the same pin. This pin is supposed to receive a signal [from] the brake light switch)
Reinstalled the std tail lights, no change. Ran a scanner (high dollar snap on) no codes, no problems showing up. No cruise!
Any ideas??
Thanls, Dave
