hi , pre thermal type gauges are higher ohms in all senders than the approx 10 - 90 ohm ( 90 =E) used with thermal regulators ; 1960 F and later are of this thermal design , They are flashing 12 v with a thermal VReg such that the average voltage / heat effect is 5 v ) its not linear either , due to doubling volts also doubles current in R , = 4 x the watts . Why if you put 12 in or regulator fails all the gauges can be burned up in 10 sec . You can see gauge rise in small steps , all is good . All of them are the same parts . Check VR grounds behind astrodome ,in those, factory was flaky , ground lug is under sheetmetal screw threaded into black plastic , often gets stripped out . The slow rise means thermal gauge . 59 i do not know , 58,57 , and maybe further back use two electric magnets , needle is balanced , if volts of car go up both magnets go up needle stays . One magnet is on car power other on the sender to ground . At F , Hot , hi oil , sender is at low ohms both magnets are about equal , pointer reads full right scalev (F) . You can tell this kind as it jumps right up and when gas sloshes in tank it moves Sadly — Vans , and another guy selling these will insist the 80-90 ohm one is right for all the cars. He has no idea what he is talking about , because not enough ohms —- it will read ~ 1/2 when tank is empty . Been there . try it in your hands , ground flange to car , before all that work gas draining etc . Measure ohms , gloat down I do not remember ohms of 57 58 ( and probably 59 , I am not near my data ) but it is like 2 x or more . Bob Merritt measured one maybe he can chime in . ( ohms at empty ) My 57-58 cars all had screwed up wrong ones in them when I got the cars . Old ones may be ok with new float you can adapt Ford brass float to end with solid 10 ga copper wire and solder etc There are other complicated cures including pretty good quality low price universal kits , did that . Not easy , too long for here , you have to make stuff , pivot in those HAS to be in center of tank height to work . Chrysler pivot is not in the middle , tank flange is at 45 degrees , adds to fun There are electronic solutions I pass. Not sure we ever found a vender who knows . Most ofvthem are reselling chinese one 80-90 ohm all the same . Even in thermal gauge car the tracking is poor . On Jun 1, 2025, at 3:18 PM, dave mason <forwardlook300@xxxxxxxxx> wrote: -- For archives go to http://www.forwardlook.net/300-archive/search.htm#querylang --- You received this message because you are subscribed to the Google Groups "Chrysler 300 Club International" group. To unsubscribe from this group and stop receiving emails from it, send an email to chrysler-300-club-international+unsubscribe@xxxxxxxxxxxxxxxx. To view this discussion visit https://groups.google.com/d/msgid/chrysler-300-club-international/5CAF69A8-52B0-4DCA-8A39-CDFE7B09CC05%40gradyresearch.com. |
Back to the Home of the Forward Look Network
Archive Sitemap