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Author Topic: Smoking light switch. Coupe S1  (Read 310 times)
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simonpen
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Posts: 85


« on: 19 April, 2021, 01:57:12 PM »

I know even less about electrics than mechanicals but I do know that my light switch should not start smoking when full beam is selected. The culprits seem to be the two red cables, one I think from the column, they both get very hot. I have not changed anything during the restoration so what is the most likely cause?
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1969 Rallye 1.3S
jus
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Posts: 47



« Reply #1 on: 19 April, 2021, 05:04:47 PM »

Do the main beams actually light up when switched?
The wires would only really do this if they were carrying way too much current than they normally do when supplying the 60W (?) bulbs. 60W / 12V = 5A per bulb at 60W. For the wires to get that hot, they may be carrying 10x that amount. If there was a dead short (i.e. the wires went straight to ground), then they'd burn in a few seconds (but the fuse should really be blowing first), so it's worth tracing the wires to see where they go. Disconnect from the front lights and see if the wires still get warm. If they do, then there's probably an issue with the switch gear or fuse connections - which would probably have been disturbed during a renovation.

Sorry I can't help more than that.
Let us know if you find anything else worth noting when testing.
Justin.
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1982 Beta Spyder
1969 S1 Fulvia 1.6HF Rallye
1971 Works Fulvia 1.6HF
1982 037 Rally
Delta S4 - coming soon
lancialulu
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Posts: 4214



« Reply #2 on: 19 April, 2021, 08:29:27 PM »

S1 light switches can short or partially short against the chassis. The fat red wire is not fuse protected....?
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Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia 1600HF
1972 1600 Fulvia Sport
1979 2500 Gamma Coupe
1988 Delta 1.6GTi
1998 Zeta
simonpen
Member
****
Posts: 85


« Reply #3 on: 20 April, 2021, 11:41:36 AM »

Thank you both. Yes the main beams do work. I have replaced the outer bulbs with H4 but they are 60w. I have bought a new switch, looking at it I cannot see how it can fail, a pretty simple thing.
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1969 Rallye 1.3S
lancialulu
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Posts: 4214



« Reply #4 on: 20 April, 2021, 03:43:13 PM »

Check carefully with an accurate ohm meter across the brass rivetted  parts. I noticed high resistance due to unseen corrosion under the rivet from a seemingly new looking switch. It failed to make the lights operate correctly.
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Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia 1.3HFR
1972 Fulvia 1600HF
1972 Fulvia 1600HF
1972 1600 Fulvia Sport
1979 2500 Gamma Coupe
1988 Delta 1.6GTi
1998 Zeta
simonpen
Member
****
Posts: 85


« Reply #5 on: 21 April, 2021, 05:06:51 PM »

Problem is solved by the fitment of a new switch.
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1969 Rallye 1.3S
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