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Thread Tools | Display Modes |
12-13-2018, 11:30 AM | #1 |
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Join Date: May 2010
Location: NorCal
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52 Mercury gauges
My friend without computer needs some help with a few issues
Mercury (52) has been converted to 12 volts Engine is a 1980 Lincoln 302 1) Gas gauge: Gauge itself is good, Sender replaced with modern unit from Concourse doesn't work. I think he needs to have the original sender rebuilt, but not sure 2) Temperature gauge: Gauge is good, Sender used is a single contact for a 52 Merc flathead. Originally 2 were used, as I recall. I think he needs the 2 contact style, as Gauge doesn't work Can you fellows help? Thanks so much Jim |
12-13-2018, 11:42 AM | #2 |
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Location: Wichita KS
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Re: 52 Mercury gauges
There is a difference between the original senders and the current ones. The latter are resistance type and the originals worked by pulsing the current. However, a resistance sender still should provide some type of reading on the gauge. The sender is providing a ground to the gauge, so to test the wiring connect the wire at the sender to ground for a short period of time and see if the gauge shows a reading. Another issue could be the sender being the wrong resistance for the gauge.
The original temp sending units were a single contact and a dual contact. The dual contact is just an on/off switch and would not be used in a non-flathead application. Again, the single contact sender is providing a variable ground to the gauge. If there is a non-conducting sealant on the sender threads it will not ground properly. Last edited by JSeery; 12-13-2018 at 11:53 AM. |
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12-13-2018, 12:40 PM | #3 |
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Location: NorCal
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Re: 52 Mercury gauges
Thanks so much, J
Really appreciate the help Jim |
12-13-2018, 01:00 PM | #4 |
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Location: Sweden
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Re: 52 Mercury gauges
My way of testing the wires to the gauge and gauge is a simple 50ohm resistor on clip leads...one cliplead to ground and other to the wire going from sender to gauge.
That should put the needle on the gauge in the middle somewhere...indicating wiring and gauge works. Also some of the regulators sold for converting 12v to 6v for the gauges are so poor they cant put out enough current and things like fuelgauge just ends up showing half when tank is full. |
12-13-2018, 04:02 PM | #5 |
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Re: 52 Mercury gauges
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