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Swap in a new relay. Check all the grounds associated with the H/L's & the mod.
So my 97 has the 4hi mod done. I have no idea when, where, who, what, or why. Will I run into problems installing barons HD 4-hi harness?
I assume not because because it's all new connectors to hook lights back up...
Just thinking if marker lights are unplugged/burnt out you get a fast blink. What happens when the headlights our unplugged/out?
Look for an oddly placed relay on the drivers side fender. I would disable the current 4hi before installing barons hd harness (to prevent possible headaches in the future)
And if our headlights are unplugged or out only that bulb is affected