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Post by skyrangerman on Nov 13, 2012 19:32:41 GMT
Hi all sonic builders. Just about to tackle the wiring of my sonic, not overly confident about it. I have the mev loom of wires and there two small electronic boards linked by some wires. Looks like one of the boards has some relays and fuses. Does this mean that I just need some fuses and relays for the engine side, how many other relays and fuses would i need , and I take it they would be around the engine bay area. Any help on what is required on top of what mev has supplied would be a great help. thanks in advance Jonathan.
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Post by andybaird on Nov 13, 2012 20:28:58 GMT
Hi Jonathan
I was nervy at doing the wiring on my Sonic at the start to.
If you look at my build thread you can see the two boxes that I put the fuses & relays in. One under the dash with the control panel for the dash and one in the engine bay with the fuse box and four relays for the starter, fan, main, and fuel relays.
If you just do one wire at a time.
Hope this helps
Cheers Andy
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Post by skyrangerman on Nov 13, 2012 21:56:23 GMT
Hi Andy, Thanks for your reply, so would i be right in saying that what you have in those two boxes is all that is needed in the way of fuses and relays? Also what size relays have you used for the engine ancilleries in your white box. Many thanks for your help. Jonathan.
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Post by avantkiwi on Nov 13, 2012 22:44:28 GMT
I ended up add 3 boxes in total, but I did not use the MEV dash. 1 in the engine bay, 1 in the front and 1 in the foot well. I needed the extra box to house the indicator and hazard relays. Exactly the same as Andy, 1 wire at a time, tag it, solder it and cover it.
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Post by skyrangerman on Nov 13, 2012 22:58:24 GMT
Cheers for that, can you remember what amperage relays you used on fuel pump, starter , cooling fan and main. Thanks Jonathan.
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Post by andybaird on Nov 14, 2012 22:22:17 GMT
Hi Jonathan
I think it was 30 Amp relays that I got from e-bay Also you need a fuse box that holds 4 fuses. I got one that holds six so I could add accessories. They are on the white box with the diagnostic plug. The black has only got the control panel from the Mev dash.
Cheers Andy
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Post by skyrangerman on Nov 15, 2012 0:33:30 GMT
Thanks for the help Andy and Avantkiwi, just got in from the garage and am starting to feel a little bit better about it all, disecting the donor loom and working out what bits I need, it is starting to make a little sense now,have mounted two boxes, one on the steering column and one in the engine bay and have mounted the ecu. Found it a bit of a job to work out which end of the mev loom was the front and which the back, seems to have nearly the same color wires out of each end, think I have got it the right way round now. Dont think it will be long before I am asking some more questions. Your help is much appreciated. Jonathan.
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Post by veefour on Nov 15, 2012 9:20:35 GMT
Hi Jonathan do not get overly worried with the wiring I found all
the supplied instructions well laid out and easy to understand.
I have now wired 2 rockets and 2 sonics and the best way is to
lay all the loom out on the frame where you would like it to end
up, apply loose cable ties at various corners of the frame so you
can thread additional wires around where you need them.
Stick religously to the correct colours and add all the wires you
need as said one at a time and have them ending where you
want boxes e.t.c and add your tag.
Leave a little bit of length on your wires it is alot easier to
shorten than extend.
As said 4 30 amp relays don't use cheap ones and use relay
bases not loose terminals.
I boxed the MEV circuitry at the front and the additional relays in
the engine bay with the diagnostic socket and a 6 way fusebox.
Don't remove the unwanted wiring from the Ford loom until your
car is running and all electrics tested.
Then pick and cut out the unwanted wires, neaten up and tape
and/or trunk .
Keep it all tidy as you do it at all times.
It is 100 times easier to wire a car if you wire tidy.
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Post by skyrangerman on Nov 15, 2012 23:14:39 GMT
Many thanks for the info Veefour, In my quest to keep it tidy and neat, is it ok to cut and rejoin(solder and heatshrink) wires from the engine loom to the ecu so as to shorten and get rid of some of the un necessary length other wise i will have to double them back on themselves lots of extra wire, by this i mean some wires which are connected correctly but go all over the place instead of nice correct routing. Many Thanks Jonathan.
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Post by veefour on Nov 16, 2012 13:17:18 GMT
Yes Jonathan it will make the engine loom far tidier with a thinner
more flexible loom.
Nice to hear you will be jointing the cables properly with solder
and heatshrink.I have seen so many car resto's and kit car's
ruined with blue crimp-ons and scotch-locks everywhere.
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Post by veefour on Nov 16, 2012 13:24:43 GMT
PM sent Jonathan.
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Post by avantkiwi on Nov 16, 2012 20:38:55 GMT
Definitly only use crimpons as a temp measure. Solder and heatshrink every connection if possible. It is not only tidier, but far more secure and less likely to leave you chasing a dodgy connection at a time in the future.
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Post by skyrangerman on Nov 20, 2012 18:55:34 GMT
Hi all, Could anyone tell me, on the Mev relay/fuseboard, the M6 bolt connection in the middle that is said on the instruction sheet to be + POS BATTERY, does this mean direct from the battery(live all the time) or via the ignition switch(only live when ignition turned on)? Thanks Jonathan.
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Post by andybaird on Nov 20, 2012 20:25:51 GMT
Hi Jonathan
If I remember I think I fitted it to the battery. My dash is live all the time. The Side lights don't need the ignition on & there is a light on the dash that is always flashing when the battery is connected. I will have a look to check if I get a chance tomorrow.
Andy
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Post by veefour on Nov 21, 2012 20:11:12 GMT
Live all the time off battery positive terminal. Also protect the
lead with a fuse to be safe but rate it high.
The biggest rating in a standard blade fuse is 40amp which even
with everything on will not draw 40amp but should the lead ever
short on anything for any reason it will blow instead of burn.
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