High Beam Help
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Mountain Pass
Joined: Mar 2019
Posts: 111
Likes: 11
From: Rancho Cucamonga
We know that there is some level of functionality with the MFS since you're getting the indicator light. The fuse should be before the MFS and the indicator in the circuit, so that is likely okay as well (but worth double-checking, really). Looking at the owner's manual, check fuse 7 (30A) and fuse 30 (15A) inside the passenger compartment. It doesn't appear that they added a relay to the system at the factory, so unless someone hacked one in, that shouldn't be a problem. (I wouldn't totally rule out wiring hackery, though, if you're not intimately familiar with the history of the vehicle. Sometimes folks will strap on light bars and wire them through the high beam circuit, and at that point who knows what's going on).
If the fuses are good, I would first check for voltage at the headlight plug and then test for voltage drop. You might also try to measure the amps going across each fuse when you turn the brights on. You can also unplug the MFS and check for resistance across the connectors that the high beam uses. It should be very close to 0 Ohms.
If the fuses are good, I would first check for voltage at the headlight plug and then test for voltage drop. You might also try to measure the amps going across each fuse when you turn the brights on. You can also unplug the MFS and check for resistance across the connectors that the high beam uses. It should be very close to 0 Ohms.
Well...I’m probably going to have to dig into it, the excursion was the take home car for a local city manager and it did have some “upfitting” with lights and radios at one time. I peeked under the dash and I’m afraid to investigate further.
Thread Starter
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Mountain Pass
Joined: Mar 2019
Posts: 111
Likes: 11
From: Rancho Cucamonga
My guess is that all the extra lights were disconnected before selling to me. The problem is, who knows what needs to be reconnected, there’s so many cut aftermarket wires.
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ojh
1948 - 1956 F1, F100 & Larger F-Series Trucks
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Oct 11, 2013 08:35 PM
