Peugeot 405 coil technical information

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Sat 3 Dec 2005 13:48
Peugeot 405 coil technical information - Crinkly Dave
Hi
1992 405 1905cc fitted with ignition amplifier integral with distributor

Broke down last night and faulty amplifier suggested by breakdown guy as no spark.

Checked through as per Haynes manual, and then swopped the amplifier (got one for £6, on a distributor, from local specialist breaker) and all now seems OK.
Only point of concern was that Haynes suggests 0.7 and 66000 ohms across primary and secondary circuits of coil, and my meter got 0.8 and 6400 ohms. Unsure if it is my meter, coil, or manual which is incorrect. Anyone sure of correct figures.

If secondary is incorrect, I may require another breakdown truck and amplifier (£27.80 from local independent) and coil
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Sat 3 Dec 2005 14:07
Peugeot 405 coil technical information - Peter D
I've looked it up and your version should be 0.8 ohm and 6500 ohms 66000 is a msipritn. Regards Peter
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Sat 3 Dec 2005 14:57
Peugeot 405 coil technical information - Crinkly Dave
Peter

Thank you. I was a bit concerned I may be called out again.

Not going to rush into buying a new one, as last one did 13 years and 222K, so the secondhand one should have a few miles in it

Alas, could not locate the thermal grease I use for attaching PC chips to heat sinks, so fingers crossed
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Sat 3 Dec 2005 14:10
Peugeot 405 coil technical information - bell boy
would suggest now you have located the fault (well done breakdown man) you buy a new one as the old one (amplifier) is an unknown quantity.
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Sat 3 Dec 2005 17:11
Peugeot 405 coil technical information - buzbee
Not too good, leaving out the heatsink compound. I don't know the ignition unit referred to, but seen plenty of examples of things failing due to getting too hot like this. Such as line output transistors in TV.

0.2 ohms (primary) is easily accounted for in the measuring leads such as connection contact resistance.

If there are shorted turns on the secondary to account for the 100 ohms lower resistance, I would expect the spark to be a lot weaker. But it is only some 1.5% difference and so, fingers crossed, it is just meter inaccuracy or a bit of manufacturing spread or combination of both.
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