Compression Ignition Addict
Join Date: Jan 2009
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Time for everybody's favorite scavenger hunt, electrical gremlins! Thanks in advance for any help, these are no fun to track down.
Here is what I've got.
Alternator is working correctly. At idle, puts out 12.5 volts, at 1300 rpm, puts out 14.4 volts. No voltage drop at the batteries or battery clamps.
However, voltmeter on the dash shows very low (at the N on normal at crusing speed and VERY low at idle. If I have the lights on, it will sometimes shut off at idle). I have an auxiliary idle controller, with digital voltmeter, hooked up and it reads 10.6 at idle and 12 at crusing speed. So, I have a significant voltage drop between the batteries and the cab.
I made some progress today when I discovered a loose fuse. The fuse for instrument illumination was loose (it used to have a jumper in it, now it doesn't fit tight). My aftermarket gauges are illuminated off that circuit. After fixing that issue, I now see 13 volts in the cab at cruising speed.
That means I am still seeing a voltage drop of 1.5 volts. Ouch.
Any suggestions of where to continue the hunt or what I should be investigating to solve this issue?
'96 F-250, 230k
Custom SVO Conversion (check valves)
On board filtration
80k SVO miles and counting!