Re: [DML] Second plea for voltage on coil

[Martin Gutkowski <webmaster@xxxx>]

It's not that simple - the coil is an inductor which means the voltage 
across it will vary depending on time. In steady-state conditions, eg 
engine not running, 7v sounds maybe a little low* but this depends on 
the state of your battery. Bear in mind that the ballast resistors are 
connected in series with the coil, which is why you don't see the 
battery voltage on it. Also bear in mind hat if properly wired up, that 
relay int he left corner of your engine bay jumps one of the two ballast 
resistors giving the coil a larger share of the voltage during cranking

* Suggest you clean and re-crimp the connectors on the right of your 
ballast resistors (but I haven't been reading this thread so maybe ou've 
done this already).

Martin
#1458
#4426

miltdanfoss wrote:

> Can someoen do me a HUGE favor and measure voltage on the #15 post on 
> the coil? It is marked. 
>
> One side is #1 one side is #15. You simply put the key in the 
> ignition and put in the on position, then measure voltage with black 
> lead on ground and positive on #15 on coil.
>
> Mine is 7 VDC, my mechanic friend says it should be 12 VDC (or 
> battery voltage to be precise).
>
> This would help me in my next troubleshooting step.
>
> Heck, I'll even throw in a MARS MER-B "Opportunity" Launch Poster for 
> the first person to tell me.
>
>
> Thanks,
> Dan in Cocoa (3932)