Glenn :
I believe the ballast resistor is about 1.5 ohms cold, rising somewhat when
it gets warm.
Unless you are worried about originality, I'd suggest buying a discrete
ballast resistor for a late '60s Chrysler product. For instance, a 1968
Dodge Dart with a 225ci slant-6 uses a very nice resistor in a ceramic
housing, with a tab so it can be bolted to the firewall, and 1/4" terminals.
Should be around $10 from any parts store.
GM and Ford products from the same period used mostly the resistance wire,
which can sometimes be found separately. Try buying the "primary wire" or
ballast resistor for a 1968 Oldsmobile Delta 88 with a 455ci V8 engine. I
found it listed at http://www.iautoparts.com for $4.20 (Standard Motor
Products P/N DDL29). Of course, the insulation color won't match ...
Randall
> -----Original Message-----
> From: owner-triumphs@autox.team.net
> [mailto:owner-triumphs@autox.team.net]On Behalf Of Glenn Rattmann
> Sent: Wednesday, January 05, 2000 9:45 AM
> To: triumphs@autox.team.net
> Subject: tr6 coil ballast?
>
>
>
> Greetings,
> My question is regarding ignition coil ballast resistance for
> the 74 TR6. I
> have read some of the archives on the subject, including Dan
> Masters' nice
> article on the VTR maintenance site.
>
> On the 74 TR6 they used a type of resistive wire about five
> feet long to
> achieve the desired value of resistance and therefore
> voltage-drop achieved
> at the coil connection. The wire goes from the coil, via the
> main harness
> and then through the firewall (left side), and splices into
> the 'regular'
> 12V source white wire under the dash, near the left-hand
> round dash vent.
>
> My ballast wire is damaged (long story) so I cannot measure
> its resistance.
> I also don't know the exact lower target voltage they want at
> the input to
> the coil, nor do I know the current involved, so I can't calculate the
> resistance needed.
>
> I'd prefer to keep things stock at this time, so I prefer
> just to replace
> the ballast wire. I'd rather not substitute a fixed resistor
> and regular
> wire, although if someone knows the characteristics of such a
> resistor I
> would consider it.
>
> BTW, the ballast wire is never mentioned in my factory manual
> because this
> scheme was used only on the 74-75-76 according to Dan Masters' note.
>
> Is there a source for the magic wire? I've called a couple
> auto-electric
> shops here and they don't have it. Any insights are
> appreciated... thanks!
>
> Glenn 74.5 TR6 (since new)
>
>
|