Author Topic: Help required with loom/harness building  (Read 8037 times)

Bob Purton

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Help required with loom/harness building
« on: June 20, 2013, 01:51:23 pm »
Who knows about microcar electrics, specifically harness building? I'm making up my own harness but need some guide lines as to the right thickness wire to use for the various applications. For instrance ,I know that the power feed positive from the battery to the ignition switch is always much thicker then the others, what amp wire is that ? Also what amp wire to power headlights etc etc?? All help much appreciated.

Rob Dobie

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steven mandell

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Re: Help required with loom/harness building
« Reply #2 on: June 20, 2013, 08:38:02 pm »
May be too obvious -but simply observing the gauge of wires used for the purposes that you are after, that are utilized by manufacturers w/o a reputation for faulty electrics may be all that is required.
Now to a problem of greater difficulty:
I still need a wiring diagram/ a picture of the driver's side below dashboard wiring  for my 1974 All Cars Charly/Snuggy.
 I have attached a photo of the area in question showing some wiring scraps that had contact adhesive residue on them that is evidence that they may have resided between the blue floorboard and the overlying carpet that I removed.
Got any polite and useful suggestions?

P.S. You can see the incredibly mysterious and awkwardly placed diagonally orientated sliding pedal in this photo!

steven mandell

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richard

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Re: Help required with loom/harness building
« Reply #4 on: June 20, 2013, 10:00:49 pm »
steven you have just outrageously hijacked bobs topic . don't you already have a thread running on your snuggy wiring diagram ?


bob i am tonight faced with very similar questions as yourself . everytime i ask anyone it soon gets a little over my head , i do have some info but not to hand i will look later tonight . my wife will have to put up with me reading yet another mucky book in bed  ;) info tomorrow night
outside of a dog a book is mans best friend. Inside of a dog it's too dark to read .Groucho Marx 1895-1977

Bob Purton

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Re: Help required with loom/harness building
« Reply #5 on: June 20, 2013, 10:30:58 pm »
You took the words right out of my mouth!

Look forward to hearing what you discovered in said mucky book!!

Bob Purton

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Re: Help required with loom/harness building
« Reply #6 on: June 20, 2013, 10:43:07 pm »
I think I found the answers on the vehicle wiring web site .
as follows



11amp.
Typical applications. Side & tail lights, alarms, reversing & rear fog lamps,
electric aerial, horns general wiring.
.

16.5amp.
Typical applications. Side & tail lights, alarms, reversing & rear fog lamps,
electric aerial, horns general wiring.


25amp.
Headlamps, fog & driving lamps,
rear screen heater, windscreen wiper motor.


33amp.
Typical applications. Charging cable for battery feed and ammeter.

.

steven mandell

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Re: Help required with loom/harness building
« Reply #7 on: June 20, 2013, 11:58:39 pm »
steven you have just outrageously hijacked bobs topic . don't you already have a thread running on your snuggy wiring diagram ?


EVIDENTLY NOT.   I have not gotten a single responce in more than five days since I posted my request for help with my car's wiring harness.
Bob's question had already been essentially answered by both my humbly stated suggestion, and the very precicely oriented link that preceeded it.
I was literally inside my Snuggy getting nowhere with my wiring loom problem when my smart phone informed me of Bob's request for help with his wiring loom.  I immediately did something that no one has done for me yet on this issue- responded with a helpful suggestion.
I am still waiting for someone to grant me the same courtesy.
I am sorry to see that neither you nor Bob appreciate my situation enough to bother to try to help me the way that I try to help others in this group.
I am truly stuck with a need for information that undoubtedly someone in this group has a better idea than myself of how to obtain

Big Al

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Re: Help required with loom/harness building
« Reply #8 on: June 21, 2013, 08:03:36 am »
The only Snuggy over here I am aware of is Gerry Starling's now. Its another car we did not have though they were close over the water. I confess to knowing nothing about them at all. All getting a bit modern for a fellow stuck in the '50's. Wiring? you were lucky. We used to 'ave magneto on t'string and Champion up our duff!

I do not know how they rate wiring. Clearly fuses are set to fail at the value of current given. So cribbing various wiring diagrams that are to all intents and purposes similar to the new wiring loom should provide the fuse values of the circuits. It is then a case of applying a % above that minimum so that the wirings is suitably robust and it is always the fuse that sacrifices itself if there is a problem. Much as suggested by Steven.
For lighting most units have the max or recommended power inscribed on them. A calculation can be made as to the loading and since 8 hole fuse boxes are cheap I would use one and have a slightly more complex loom than running slightly higher loads.

The heaviest wire outside the dynostart/starter will be the ignition feed as much of the fuse box will work off that. If fused I believe they are normally 30 amp. That would suggest a run of 50 amp wire from regulator live to the ignition switch. That could be to heavy, I do not know.

Hope that helps.
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Bob Purton

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Re: Help required with loom/harness building
« Reply #9 on: June 21, 2013, 09:26:09 am »
Thanks Al. I plan on using a Schmitt fuse box although many microcars had few if any fuses at all. My Inter has none, and  Thumper has just two as I recall. I do plan to adapt a circuit from lay outs I already have such as Bond Minicar etc and as Steve suggested, calipering off some wires from the Isetta will give me a good idea anyway.

richard

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Re: Help required with loom/harness building
« Reply #10 on: June 21, 2013, 05:21:14 pm »
mostly helpful but can be conflicting info. i have this from AUTOSPARKS catalogue

am i correct that 12v headlamp wiring , for the same watt bulb , would be much thinner wire i.e. less strands , than 6v - in my complete ignorance i would have thought the other way around - worth checking it out then
« Last Edit: June 21, 2013, 05:30:44 pm by richard »
outside of a dog a book is mans best friend. Inside of a dog it's too dark to read .Groucho Marx 1895-1977

richard

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Re: Help required with loom/harness building
« Reply #11 on: June 21, 2013, 05:28:08 pm »
i have this old wiring harness from a Gordon , at a glance i thought thats simple they all look the same . NOT SO ! despite looking similar i have peeled back a red/blue and found it 28/0.30 and the green and found that to be 14/0.30 ! i am checking them all out and will report back later on which are what bob
« Last Edit: June 21, 2013, 05:29:54 pm by richard »
outside of a dog a book is mans best friend. Inside of a dog it's too dark to read .Groucho Marx 1895-1977

Big Al

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Re: Help required with loom/harness building
« Reply #12 on: June 21, 2013, 06:45:25 pm »
mostly helpful but can be conflicting info. i have this from AUTOSPARKS catalogue

am i correct that 12v headlamp wiring , for the same watt bulb , would be much thinner wire i.e. less strands , than 6v - in my complete ignorance i would have thought the other way around - worth checking it out then

Well that there illustration is pretty much the answer. Worth saving that.
Messerschmitt set, Goggo Darts, Heinkel 175, Fiat Jolly, Autobianchi, Fairthorpe Electron Minor, Borgward, Isuzu Trooper
Citroen BX 17TZD & GTI 16v
Held - MG Magnette ZB & 4/44
For sale - Vellam Isetta, Bamby, AC Type 70, Velorex, Church Pod, Reliant Mk5, KR200,  Saab 96, Bellemy Trials, Citroen BXs

richard

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Re: Help required with loom/harness building
« Reply #13 on: June 21, 2013, 07:18:52 pm »
this is the Bond Mk A terminal block incorporating 1 fuse - the Gordon had none. A nice bit of " englishness " bob. unfortunately no wiring attached
« Last Edit: June 21, 2013, 07:25:03 pm by richard »
outside of a dog a book is mans best friend. Inside of a dog it's too dark to read .Groucho Marx 1895-1977

Barry

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Re: Help required with loom/harness building
« Reply #14 on: June 21, 2013, 10:23:12 pm »
I'm con-fused

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« Last Edit: June 21, 2013, 10:36:21 pm by Barry »