MGB & GT Forum
Switched out fuse box...Uh Oh...
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Apr 9, 2024 07:20 PM
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 Joined 6 years ago
2,459 Posts
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Apr 9, 2024 11:40 PM
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Joined 12 years ago
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BEST "AntiTheft" device posted this year so far Great Job. 
IN ALL SUBJECTS.: For those who believe, no proof is needed. For those who don’t believe, no proof is possible.
"Strive for perfection in everything. Take the best that exists and make it better. If it doesn't exist, create it. Accept nothing nearly right or good enough"
Sir Henry Royce
co-founder of Rolls-Royce .
"I take no credit for my own, of another man's fame".
Joe Baba 2021
In reply to # 4782173 by RestorerMG
Hello all,
After describing what the car is doing, I will be open to any humor that you see in my predicament...I'm prepared...
Switched out the old fuse box to a 12-position blade type box.
As it stands now:
Engine only turns over and starts if light switch is on.
Turn on light switch, fuel pump starts.
turn lights off, turn key to ON position, fuel pump starts.
Turn key to start, nothing except fuel pump.
Switch on light switch, car starts.
Turn lights off, engine still runs but dash gauges shut down.
I've been tracing wires to see if I connected two (some) of them wrong. I had to double up the circuits because of the 12 fuse connections.
Also, I was told the new box needed to have a circuit "jumped" which I do not know what that accomplishes.
With engine off and light switch on, every fuse post has power.
Noticeable with new fuse box, brighter lights, more responsive blinka's.
I know it might be hard to follow my description but if i can get guidance for the correct connections, I appreciate it!
Car is drivable as long as parking light are on...everything else electric functions fine.
I think I need to start from square one...
Thanks All,
Bill
(Wire nuts are temp.,)
After describing what the car is doing, I will be open to any humor that you see in my predicament...I'm prepared...
Switched out the old fuse box to a 12-position blade type box.
As it stands now:
Engine only turns over and starts if light switch is on.
Turn on light switch, fuel pump starts.
turn lights off, turn key to ON position, fuel pump starts.
Turn key to start, nothing except fuel pump.
Switch on light switch, car starts.
Turn lights off, engine still runs but dash gauges shut down.
I've been tracing wires to see if I connected two (some) of them wrong. I had to double up the circuits because of the 12 fuse connections.
Also, I was told the new box needed to have a circuit "jumped" which I do not know what that accomplishes.
With engine off and light switch on, every fuse post has power.
Noticeable with new fuse box, brighter lights, more responsive blinka's.
I know it might be hard to follow my description but if i can get guidance for the correct connections, I appreciate it!
Car is drivable as long as parking light are on...everything else electric functions fine.
I think I need to start from square one...
Thanks All,
Bill
(Wire nuts are temp.,)
IN ALL SUBJECTS.: For those who believe, no proof is needed. For those who don’t believe, no proof is possible.
"Strive for perfection in everything. Take the best that exists and make it better. If it doesn't exist, create it. Accept nothing nearly right or good enough"
Sir Henry Royce
co-founder of Rolls-Royce .
"I take no credit for my own, of another man's fame".
Joe Baba 2021
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Apr 10, 2024 05:50 AM
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Joined 6 years ago
1,609 Posts
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It’s a good idea to modernise the electrics. They were just about adequate for the 1960’s. But after 40-60 years of wear & tear, there’s probably quite a few areas which could be improved. Anything that reduces the chance of the car going up in smoke is a good idea. Bill’s idea is a good one, but just needs a few tweaks in the execution. Here's one of the many skinned cat options.
Attachments:
MGB Ripca fusebox V1.JPG 73.5 KB
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LOL...Cool!! (Not so much)...
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Apr 10, 2024 10:10 AM
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Joined 12 years ago
1,009 Posts
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Apr 10, 2024 10:15 AM
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Joined 6 years ago
1,609 Posts
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Made by a company called Ripca. Think I got mine on Ebay. Yes they come with a cover.
Attachments:
MGB Ripca cover.JPG 76.1 KB
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Apr 10, 2024 12:36 PM
Top Contributor
Joined 12 years ago
29,281 Posts
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TOTALLY AGREE: Everything else looks "Cluttered", NOT Pretty at all. Four is enough. Wrap some of the clutter. 
IN ALL SUBJECTS.: For those who believe, no proof is needed. For those who don’t believe, no proof is possible.
"Strive for perfection in everything. Take the best that exists and make it better. If it doesn't exist, create it. Accept nothing nearly right or good enough"
Sir Henry Royce
co-founder of Rolls-Royce .
"I take no credit for my own, of another man's fame".
Joe Baba 2021
In reply to # 4783317 by Mudlark
There have been several posts about a modern 4 blade fuse fuse box for the MGs. That is the best and easiest conversion on this planet! Put that 12 blade in the "opps" box and get the 4 blade unit. Also if you didn't download those wiring diagrams, go back and do it. They are the tops and absolutely necessary in dealing with the Prince of Darkness.
IN ALL SUBJECTS.: For those who believe, no proof is needed. For those who don’t believe, no proof is possible.
"Strive for perfection in everything. Take the best that exists and make it better. If it doesn't exist, create it. Accept nothing nearly right or good enough"
Sir Henry Royce
co-founder of Rolls-Royce .
"I take no credit for my own, of another man's fame".
Joe Baba 2021
Member Services:
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Apr 10, 2024 01:31 PM
Top Contributor
Joined 4 years ago
346 Posts
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Another image that is ugly - a fried wire within the loom because there was no fuse to protect it.
Attachments:
FriedWire.jpg 26 KB
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Apr 11, 2024 06:40 PM
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Joined 4 years ago
346 Posts
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Almost. You really should be looking at the Advance wiring diagram. Here's a screen grab from the page with North American '74...
You need to jump the two top left terminals to get power from the light switch (red/grn) to all the light circuits on the left side (red).
The ?? where you have some brown wires - those should be 1) the white wire from the ignition switch (which brings KO power to your fuse box) and 2) the white wire that take KO power to your coil.
The stated wire colors are assuming that wires haven't been replaced with different colors - but that's what they should be connected to.
You need to jump the two top left terminals to get power from the light switch (red/grn) to all the light circuits on the left side (red).
The ?? where you have some brown wires - those should be 1) the white wire from the ignition switch (which brings KO power to your fuse box) and 2) the white wire that take KO power to your coil.
The stated wire colors are assuming that wires haven't been replaced with different colors - but that's what they should be connected to.
Attachments:
Screen Shot 2024-04-11 at 7.29.44 PM.jpg 11.6 KB
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Apr 11, 2024 06:47 PM
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Joined 6 years ago
2,459 Posts
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