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<blockquote data-quote="EdMuse" data-source="post: 1276223" data-attributes="member: 564149">Volvos are made in Sweden (or at least they used to be).&nbsp; It gets pretty cold there, so their heating systems tend to be pretty good.&nbsp; Even with the heat cranked, it ends up being cooler by the time it difuses out into the cabin.&nbsp; Still, I keep the heat slider about a finger&#039;s width from minimum in the winter, and that&#039;s warm enough.&nbsp; It might make sense to point out that I used a meat thermometer to check the temp, and they are designed to be imersed in whatever they are measuring, so it&#039;s possible that it&#039;s even hotter in there.&nbsp; That&#039;s why I&#039;m worried about getting anything expensive, for fear it will fry, too.As for grounding, I&#039;m not sure what you mean.&nbsp; Negative ground is &quot;regular ground.&quot;&nbsp; I don&#039;t know if I&#039;ve ever had a positive ground car (the only other option).&nbsp; Ford did it in the &#039;40s, and MG was the last car company I know of that did positive ground systems in their cars, and that was in the &#039;60s.&nbsp; I had a &#039;64 MGB, and it was negative ground, though it may have been converted.Pardon me for engaging in my vocation as teacher, but allow me to explain that there are two ways to hook up the electrical systems in a car, the difference being which battery terminal is connected to the bodywork.&nbsp; In a positive ground system, the + terminal is connected to the bodywork, so the power flows out through the bodywork into the wiring for any component in the car.&nbsp; Then, wiring harnesses carry the flow of electrons back to the - terminal.The other, more common way to do it is to have the wiring harnesses carry the flow of electrons out from the + terminal of the battery to the components, then they flow back through the bodywork to the - terminal.Thus, in either case, the components are grounded to the bodywork, but in a positive ground system, the bodywork is hooked up to the positive terminal, and in a negative ground system, the negative terminal is.&nbsp; And, as I mentioned, negative ground is far more common overall, and currently, I can only imagine, universal.&nbsp; Besides, if you have a car which uses one system and a stereo which is made for the other, for instance an old, positive ground Jaguar, MG or Triumph, and a modern, negative ground stereo, then, at best, the stereo will just not work, and at worst, it will explode in a lovely shower of sparks.&nbsp; What fun!So, since my stereo still works, marginally, that can&#039;t be the problem.-EdM.</blockquote>

[QUOTE="EdMuse, post: 1276223, member: 564149"] Volvos are made in Sweden (or at least they used to be). It gets pretty cold there, so their heating systems tend to be pretty good. Even with the heat cranked, it ends up being cooler by the time it difuses out into the cabin. Still, I keep the heat slider about a finger's width from minimum in the winter, and that's warm enough. It might make sense to point out that I used a meat thermometer to check the temp, and they are designed to be imersed in whatever they are measuring, so it's possible that it's even hotter in there. That's why I'm worried about getting anything expensive, for fear it will fry, too. As for grounding, I'm not sure what you mean. Negative ground is "regular ground." I don't know if I've ever had a positive ground car (the only other option). Ford did it in the '40s, and MG was the last car company I know of that did positive ground systems in their cars, and that was in the '60s. I had a '64 MGB, and it was negative ground, though it may have been converted. Pardon me for engaging in my vocation as teacher, but allow me to explain that there are two ways to hook up the electrical systems in a car, the difference being which battery terminal is connected to the bodywork. In a positive ground system, the + terminal is connected to the bodywork, so the power flows out through the bodywork into the wiring for any component in the car. Then, wiring harnesses carry the flow of electrons back to the - terminal. The other, more common way to do it is to have the wiring harnesses carry the flow of electrons out from the + terminal of the battery to the components, then they flow back through the bodywork to the - terminal. Thus, in either case, the components are grounded to the bodywork, but in a positive ground system, the bodywork is hooked up to the positive terminal, and in a negative ground system, the negative terminal is. And, as I mentioned, negative ground is far more common overall, and currently, I can only imagine, universal. Besides, if you have a car which uses one system and a stereo which is made for the other, for instance an old, positive ground Jaguar, MG or Triumph, and a modern, negative ground stereo, then, at best, the stereo will just not work, and at worst, it will explode in a lovely shower of sparks. What fun! So, since my stereo still works, marginally, that can't be the problem. -EdM. [/QUOTE]

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