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Headlamp amp draw and fuses


 
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kevinv123
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Joined: 26 Dec 2017
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PostPosted: Tue Dec 26, 2017 4:56 pm    Post subject: Headlamp amp draw and fuses Reply to specific post Reply with quote

I just bought a '52 Ferguson T030, all original condition. 6v, NOT converted. Runs, starts, drives in perfect condition. Head lights didn't work but the system is simple so I gave it no thought.

Had some time to troubleshoot and found an in line fuse holder and a blown 30a fuse. Put a new one in and same result.

PO has several crimp style butt slice connectors and the rear work light all wired on the same circuit (according to the schematic in the manual this is original ). I removed the work light but suffered the same result.

Next up is rewiring the headlights to remove the splices, unnecessary spade connectors, any possible shorts, corrosion, etc.

All 3 lights are confirmed 6v. Battery is 8v.

I have 3 questions;

1) current wires are 10 ga. Is this correct?

2) Schematic not clear on presence and or size of fuse. No mention in any specs or text of either size or presence. Did it have one originally? If so any idea of capacity?

3) How much amperage do the headlights draw? Anyone know the wattage of 6v sealed beams? Generic Web search says 30 watts so I think 5 amps each. Correct?

Kevin V.
 
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Steve@Advance
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PostPosted: Tue Dec 26, 2017 5:22 pm    Post subject: Re: Headlamp amp draw and fuses Reply to specific post Reply with quote

The 10 ga wire will work, but doesn't need to be that big for lighting. Could use 12 or 14 ga, easier to work with, neater. There may have been 10 ga on the generator armature, and regulator battery terminal.

Not sure about the fuse. I've seen a fuse built into the light switch on some. Would not hurt to have one though, especially on the light circuit. A 20 amp would work.

You are correct on the lamp amps.

Sounds like there is a short to ground somewhere if it instantly blows fuses. Could be a pinched wire, mouse chewed, burned. I would disassemble each light down to the lamp base. Could be original wiring inside that has completely lost all insulation.
 
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Charles in Aus.
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Location: Victoria , Australia

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PostPosted: Wed Dec 27, 2017 4:15 am    Post subject: Re: Headlamp amp draw and fuses Reply to specific post Reply with quote


I would add that the cause of strange shorts can often be the fault of the switch . Try isolating it and using bare wires to open and close the circuit to confirm or eliminate it as a cause .
 
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kevinv123
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PostPosted: Wed Dec 27, 2017 4:57 am    Post subject: Re: Headlamp amp draw and fuses Reply to specific post Reply with quote

Thanks for the quick replies. I am going to re-wire with 12 ga. with a fuse. As for the switch, I did give that some thought too.
I might wire in a temporary to remove that as a variable.
 
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Mule Meat
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PostPosted: Fri Dec 29, 2017 3:19 pm    Post subject: Re: Headlamp amp draw and fuses Reply to specific post Reply with quote

52 Should be a Positive Ground system.

Could someone along the line wired it up backwards causing a shorted system?
 
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kevinv123
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PostPosted: Sat Dec 30, 2017 5:03 am    Post subject: Re: Headlamp amp draw and fuses Reply to specific post Reply with quote

CVPost-Mule Meat wrote:
(quoted from post at 19:19:04 12/29/17) 52 Should be a Positive Ground system.

Could someone along the line wired it up backwards causing a shorted system?


Not so far as I can tell. Re-wring the circuit later today and tomorrow.

As for the battery yes it is still positive ground.
 
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