L35 temp and fuel gauges not working

Treb

New member

Equipment
RTV900 and ZG20
Jul 17, 2015
2
0
1
West Monroe, LA, USA
Ground is good, got 12 volts but missing 7 volt, research says the 7 volt comes from the 12V through a voltage regulator/limiter. Can’t find the limiter, supposed to be on the back of the printed circuit board of instrument panel. Problem started when I replaced the panel bulbs with LED’s, I had also replaced the glow plug relay, controller and shutoff timer relay at the same time. Any help would be much appreciated!!
 

Sawdust&Shavings

Active member
Lifetime Member

Equipment
BX1870,LA203A,BX6315,BX2767,RCK48-18BX,GCK60-23BX
Apr 25, 2023
155
168
43
69
Stafford, VA
Ground is good, got 12 volts but missing 7 volt, research says the 7 volt comes from the 12V through a voltage regulator/limiter. Can’t find the limiter, supposed to be on the back of the printed circuit board of instrument panel. Problem started when I replaced the panel bulbs with LED’s, I had also replaced the glow plug relay, controller and shutoff timer relay at the same time. Any help would be much appreciated!!
Any chance the fact that LEDs draw significantly less current than 12 volt incandescent bulbs is part of your challenge?
 

Treb

New member

Equipment
RTV900 and ZG20
Jul 17, 2015
2
0
1
West Monroe, LA, USA
I kicked that idea around but according to the wiring diagram it shouldn’t make a difference, plus all the lights are off once the tractor starts up. It’s no big deal to put the bulbs back in to see if that makes a difference.
 

GreensvilleJay

Well-known member

Equipment
BX23-S,57 A-C D-14,
Apr 2, 2019
13,483
6,072
113
Greensville,Ontario,Canada
would need to see picture of the panel as well as wiring diagram though it sounds 'old skool' + 12 to VR to gauges to sensors. so no LEDs will not be the problem.
You could have lost ground to the VR, depending on type of VR used. Old style would be bimetallic controller, new will be electronic.