Voltage drop
CF Veteran
Joined: May 2011
Posts: 1,578
Likes: 302
From: Central Iowa
Finally found the problem, the issue is the volt meter. With high beams on the volt meter will fall to 12V and lower, Meter reading at the battery is 13.6-14V.
I will install a second volt meter directly from the battery. I also notice when the high beams are switched the oil pressure and gas gauge flicker.
I will install a second volt meter directly from the battery. I also notice when the high beams are switched the oil pressure and gas gauge flicker.
If the oil PSI and fuel gauge are “flickering” with the high beams, a couple of possibilities come to mind:
1) There’s an issue with the headlights circuitry causing excessive current draw or back-feeding of some sort. Could be a faulty switch or relay, bad ground, weak connection or other wiring problems.
2) There’s other issues with the cluster, and in my experience with these trucks, that’s the most likely case.
Either scenario is going to require further diagnosis to confirm.
Thread Starter
CF Beginner
Joined: Sep 2020
Posts: 6
Likes: 0
Good to know you figured it out.
If the oil PSI and fuel gauge are “flickering” with the high beams, a couple of possibilities come to mind:
1) There’s an issue with the headlights circuitry causing excessive current draw or back-feeding of some sort. Could be a faulty switch or relay, bad ground, weak connection or other wiring problems.
2) There’s other issues with the cluster, and in my experience with these trucks, that’s the most likely case.
Either scenario is going to require further diagnosis to confirm.
If the oil PSI and fuel gauge are “flickering” with the high beams, a couple of possibilities come to mind:
1) There’s an issue with the headlights circuitry causing excessive current draw or back-feeding of some sort. Could be a faulty switch or relay, bad ground, weak connection or other wiring problems.
2) There’s other issues with the cluster, and in my experience with these trucks, that’s the most likely case.
Either scenario is going to require further diagnosis to confirm.
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