electrical adventures

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dfish1914

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what kind of proplem would cause all lights pulsate when you start a car. 1974 dart to be specific. has MSD . thanks
 
Im having almost the same problem in my 73 except mine go on and off after about 5 min. Just the headlights not the parking lamps. Ive checked all the wiring now Im down to replacing the switch. I hope that fixes the issue.
 
In your case it probably is the headlight switch. They have a built in, auto reset breaker. If a connection gets hot, if the switch contacts start to go bad, or if the breaker itself gets old and weak, it will cycle just like a flasher

Be sure to check that all connections on the switch are clean tight, and do not show signs of "meltage." (Which can lead to "smokage")
 
MRFIT4SPEED said:
Im having almost the same problem in my 73 except mine go on and off after about 5 min. Just the headlights not the parking lamps. Ive checked all the wiring now Im down to replacing the switch. I hope that fixes the issue.
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Mine do the same thing! I was driving home at 3am and the light went off, then on over and over. Switching high to low beam helped for a few minutes, but not entirely. I changed my high beam switch and they worked for a week and just the last time I drove it (at 3 f-ing am) it started again. Is it the headlight switch do you suppose?
 
Mopar to ya said:
Mine do the same thing! I was driving home at 3am and the light went off, then on over and over. Switching high to low beam helped for a few minutes, but not entirely. I changed my high beam switch and they worked for a week and just the last time I drove it (at 3 f-ing am) it started again. Is it the headlight switch do you suppose?
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Read my post. IF you replaced the switch, AND it's a good switch, it's either something drawing too much current, or one of the connections right at the headlight switch heating up.
 
67Dart273 said:
Read my post. IF you replaced the switch, AND it's a good switch, it's either something drawing too much current, or one of the connections right at the headlight switch heating up.
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I have non stock Hella conversion headlights. I didn't upgrade the bulb wattage but suspected too much of a draw was shutting something down. I have a brand new switch in my car that I am going to install during a break in the action here at work. Tonight (at 3 f-ing am!) I will find out if that was the fix or not. If you ever drive at night, I highly recommend this conversion. The difference is like night and day. (Pun intended)
 
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