78dattysun Posted June 6, 2012 Report Share Posted June 6, 2012 I have a 71 510 wagon and my fuel/temp guage arent working. so I figured its the voltage regulator but im having trouble just finfing the thing. theres too many little regulators and relays. A direct pic of it would be awesome cuz ive looked and looked already on here an in the books. But whats weird is that the fuel guage started randomly working for a few days then stopped again. they are both currenly not working. so makes me think it may not be the regulator may/be? any ideas Quote Link to comment
banzai510(hainz) Posted June 6, 2012 Report Share Posted June 6, 2012 those volt regs are just a wrapped wire inside of a the silver can in back of the instrument panel. I owuld just ohm out the can and trace it back to the main connector. Sometimes a trace can crack .PWER or the ground. or just reseat the can and it might work. Quote Link to comment
DanielC Posted June 6, 2012 Report Share Posted June 6, 2012 This is a picture of the back of a 521 instrument panel. The rectangular thing above, and slightly to the left of center of the speedometer is the instrument voltage regulator. The speedometer is the large square thing with rounded corners. The speedometer has two Phillips screws, on a diagonal, with the speedometer cable attachment between them. Quote Link to comment
the nice machine Posted June 6, 2012 Report Share Posted June 6, 2012 I have a 71 510 wagon and my fuel/temp guage arent working. so I figured its the voltage regulator but im having trouble just finfing the thing. theres too many little regulators and relays. A direct pic of it would be awesome cuz ive looked and looked already on here an in the books. But whats weird is that the fuel guage started randomly working for a few days then stopped again. they are both currenly not working. so makes me think it may not be the regulator may/be? any ideas my fuel/temp gauges stopped working a while back in my 78 b210, i checked all of the fuses and they were good. a test light on the fuse for those guages worked, but then i noticed after about 5 seconds it would short out. so i cleaned up my fuse box and that fixed it. could be as simple as that. just crud on your fuse terminals. Quote Link to comment
78dattysun Posted June 6, 2012 Author Report Share Posted June 6, 2012 Awesome thanks for your help. I actually just figured out. Its inside the instrument panel attached to the green electrical board that hold on the temp and fuel gauge. I'll try and get pics later. Quote Link to comment
ggzilla Posted June 6, 2012 Report Share Posted June 6, 2012 In a 620, the instrument panel voltage regular is in the temp gauge. Quote Link to comment
datzenmike Posted June 7, 2012 Report Share Posted June 7, 2012 Geez, good stuff ggzilla. Bet the 720s are the same. Quote Link to comment
bryant2482 Posted June 17, 2012 Report Share Posted June 17, 2012 my gauges are jumping up and down. when i accelorate they keep climbing but when i let off the gas they go back down. my turn signals are acting up as well Quote Link to comment
datzenmike Posted June 17, 2012 Report Share Posted June 17, 2012 Check your alternator output at the battery with a volt meter at idle and when revved up. It should be regulated at about 13.8 to 14.8. Clean and tighten the battery clamps on the posts. Quote Link to comment
ggzilla Posted June 17, 2012 Report Share Posted June 17, 2012 Yep, that's a Voltage Regulator problem not a Gauge Regulator problem. Turn signals don't work off the gauge regulator. Only the temp and fuel gauges do. Quote Link to comment
bryant2482 Posted June 17, 2012 Report Share Posted June 17, 2012 ok well where on a 720 would the "voltage regulator" be located? Quote Link to comment
ggzilla Posted June 18, 2012 Report Share Posted June 18, 2012 Probably in the same place! In the temperature gauge. Check your repair manual to double-check it. Quote Link to comment
'70dime Posted June 20, 2012 Report Share Posted June 20, 2012 I figured I would post in here rathere than start a new thread, I have a 9/69 510 with the sweeper gauges. My fuel gauge quit working a while ago and it hasn't bothered me but I run out of gas ONE time with my girl in the car and now she refuses to get in. So at this point I have pulled the cluster. I have power going into the cluster, I had to fix one burnt part of the circuit board with a silver pen. I checked and I have continuity so my fix worked, I pluged the cluster back in... still no gauge. I checked for the plusing voltage at the sending unit and found that I have no voltage there. So then I checked for voltage at the two wire pigtail near the cluster and I dont have voltage there either. At this point is it safe to assume I need a new temp gauge with a good voltage regulator? Quote Link to comment
metalmonkey47 Posted June 20, 2012 Report Share Posted June 20, 2012 Pierce, have you checked for resistance @ the fuel level sender at the gas tank to start? Just do a simple continuity test between the wires on the tank to make sure the windings on the sender aren't broken. Quote Link to comment
'70dime Posted June 20, 2012 Report Share Posted June 20, 2012 I would but I grounded out the sending unit wire which in theory would point to a break in the sending uint signal wire. I have continuity there all the way to the pigtail. And the sending unit was replaced in '05 after the tank was dipped. the reason I'm thinling the voltage regulator in the temp gauge in the aforementioned burnt up circuit board, I figure my problem lies back there. Quote Link to comment
datzenmike Posted June 20, 2012 Report Share Posted June 20, 2012 If TEMP and GAS gauges are both not working likely the volt regulator is faulty. Are your CHARGE and OIL lights working in the dash??? Is working then the fuse that powers the volt regulator is fine. If the temp gauge is working then the volt regulator is working too. YES temp working... Ground the yellow wire at the tank.... gauge should read FULL. YES? sender in tank may be bad or tank poorly grounded. Run a good ground wire to tank. NO? wire between tank and gauge may be pinched under rear seat or connector plug on the harness corroded or bad contact. Quote Link to comment
'70dime Posted June 20, 2012 Report Share Posted June 20, 2012 Thanks Datzen, you confirmed my thoughts. I'm gonna go through one more time and check all connections before buying a new gauge. Quote Link to comment
bryant2482 Posted June 25, 2012 Report Share Posted June 25, 2012 my signals in my dash cluster flicker for no reason now when the engine goes over 2000 rmps. whats up with that? Quote Link to comment
ggzilla Posted June 25, 2012 Report Share Posted June 25, 2012 Now? Last week you said: my gauges are jumping up and down. when i accelorate they keep climbing but when i let off the gas they go back down. my turn signals are acting up as wellWhat has changed between now and last week? Quote Link to comment
bryant2482 Posted June 25, 2012 Report Share Posted June 25, 2012 yea first my fuel and temp gauges start to sky rocket and still do to this day. then i was driving early in the morning so i had my lights turned on and the little display arrows on the cluster will flicker for no reason at all. so now im wondering if i might have a loose connection behind the cluster because i installed a fter market tach a few weeks ago and have had the cluster out a few times since Quote Link to comment
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