Looking for troubleshooting directions for a dead fuse terminal - Alfa Romeo Bulletin Board & Forums
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post #1 of 5 (permalink) Old 02-23-2019, 06:20 PM Thread Starter
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Looking for troubleshooting directions for a dead fuse terminal

Hi guys-Electrical troubleshooting is a bit of a black arts thing for me. I have a number of accessories not working-running lights, tail lights, fan, instrument lights etc and have not worked since I bought the car-1974 GTV (Euro delivery)

Fuses all pass a continuity test and have been cleaned. The fuse terminal block however is not passing a continuity test when the fuses are pulled in fuse slot #1 and #6. My owners manual shows 1-4 as being main devices (so broad as to be not helpful and #6 shows as Indicating devices

My wiring diagram is hard/impossible to read so I'll probably end up buying one of those large laminated ones. That being said, I'm hoping for suggestions or a link to a previous post that may shine a light (pun intended) on my path to enlightenment.

Please advise and thanks
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post #2 of 5 (permalink) Old 02-23-2019, 07:29 PM
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My knowledge of automotive electricity is limited to the smoke theory - that electricity moves through the wires by smoke. When the smoke escapes things stop working...

As for Alfa fuse boxes, I always suggest a couple of things. 1) if the fuses are of unknown vintage replace them. Somehow the bullet type fuses in our cars can appear OK and even pass a test with an ohm meter but in use they fail to allow sufficient electrons to flow. Especially the fuses with the aluminum strip. I prefer the fuses with a brass strip. If needed, gently bend the fuse contacts so they are held firmly in place.

And B), unhook and lower the fuse box down, turn it around and check that all the connectors in the back are fully inserted. It can help to one by one remove and re-insert each connector. Doing this scrapes off any slight corrosion making for a more reliable connection.

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post #3 of 5 (permalink) Old 02-23-2019, 08:26 PM
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In one Ferrari,a '65 I had the copper wire inside the screw tensioned hole in the back of the fuse block oxidize, turning black. Continuity was lost despite a tight screw. I shortened the wire, re-stripped the same amount of insulation, reinstalled the shiny copper wire (braided) and all was well. I thought about removing every wire, and tinning the bare copper ends with solder before re-inserting and tightening ALL those screws. Then I though... "You FIXED it. All the rest are bare copper and NOT black. Call it GOOD". Years later it was still fine, and NO SMOKE had ESCAPED!
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post #4 of 5 (permalink) Old 03-23-2019, 04:44 PM
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Fuses 1-4 are all "always hot" circuits which should operate when the car is off, key is removed. These include interior lights, brake lights, wipers, turn signals, hvac blower. These four terminals are "bussed" on the hot side meaning a single 10ga wire from the starter feeds all four. I would look to see if this wire has +12v at both of its ends. Do you have attached wiring diagram from papajam? There are many versions of it, there may be one more correct to your Euro car than I am attaching.

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Originally Posted by Austin Alfa View Post
Hi guys-Electrical troubleshooting is a bit of a black arts thing for me. I have a number of accessories not working-running lights, tail lights, fan, instrument lights etc and have not worked since I bought the car-1974 GTV (Euro delivery)

Fuses all pass a continuity test and have been cleaned. The fuse terminal block however is not passing a continuity test when the fuses are pulled in fuse slot #1 and #6. My owners manual shows 1-4 as being main devices (so broad as to be not helpful and #6 shows as Indicating devices

My wiring diagram is hard/impossible to read so I'll probably end up buying one of those large laminated ones. That being said, I'm hoping for suggestions or a link to a previous post that may shine a light (pun intended) on my path to enlightenment.

Please advise and thanks
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File Type: pdf 11501 2000 GT Veloce 1973 R5.pdf (54.5 KB, 8 views)

'73 GTV bare metal project... nearing 'car' status
E30 Daily - '65 912 project... no longer in waiting
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post #5 of 5 (permalink) Old 03-23-2019, 04:49 PM
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Found a pic of the fuse box showing the bussing in question. Do you have +12v at all times at the bussed side of fuses 1,2,3,4?
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'73 GTV bare metal project... nearing 'car' status
E30 Daily - '65 912 project... no longer in waiting
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