HI i need a diagram to check i have put my new ht leads corectly

go google and type in---firing order for mercedes 500 1988 model-- sites will show lead placement and rotor direction

Technical: HT Leads diagram? - The FIAT Forum

www.fiatforum.com > FIAT Cars > Cinquecento / Seicento
Aug 30, 2008 - 9 posts - ‎3 authors Anyone got a simple diagram of where each lead goes from each plug to which ... Makesure the HT leads are on correct, then try them either way. ... As long as 1+4 spark plugs go to one coil pack, then 2+3 go to the other coil ... Fuel light flashing but won't start (No spark)
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ignition - Methods of diagnosing a non-starting Fiat Uno ...

coil HT lead to centre contact on dist cap ,the remaining HT leads go to the spark plugs you will need the firing order to get them on the correct plug follow this link may have to research site for your year vehicle
1967 1972 Chevrolet Spark Plug Wiring Diagrams

check if you put all the connectors in place and the distributor coil lead is on and also you put all the ht leads in the correct firing order 1 3 4 2.

Go back and pull each spark plug wire and put it right back on. There is probably a loose one. This is assuming that you didn't pull all the wires off at once when changing the plugs. If you did, the you put the wires back on in the wrong order. Then, you'll need to find a manual online for the correct wiring order for the plug wires.

If they are on in the right order, you need new plug wires. They don't last forever!

Check the timming.And make sure the HT leads ar fitted corectly.

remove the dizzy cap, crank motor over to find out the rotation of the rotor. Remove the no.1 spark plug and bring no.1 piston up to top dead centre on compression stroke, mark side of dizzy body where the end of the rotor points to, replace dizzy cap and see which lead it lines up with.
that will be your no.1 lead, find the firing order and put the leads back on the dizzy cap in the direction of the rotors rotation, run those leads to the corresponding plugs and it should start.

check spark plug gaps are set correctly and that leads are in correct order if you took all leads off at same time its easy to mess up just one or two

There are several things it could be and not necessarily to do with the plugs.

1. did you reconnect the ht leads in the correct order? They must be in the correct firing order.

2. have you tested the HT leads for electrical continuity? The carbon powder type can breakdown easily.

3. Are the HT lead connectors ok? Make sure you have continuity.

Hi,
Check and clean spark leads, check and clean distributer cap or around coil pack areas.

Most likely cause is a fault around this HT area and distribution of spark.

Use an ignition sealer or buy a new set of HT leads - and replace them in the correct order (do one at a time).

Hope this helps.