Recent content by Selkirk_D

Now this is bad. LOL!!

So finally got new switch and glow indicator installed. Connector at firewall shows 11.25 volts on preheat with no plugs connected. 11.02 volts cranking. Indicator glows nicely now. True test will be how easy it starts when temp drops below 20. Likely this fall. Thanks Wolfman, as usual you were...

Sorry Wolfman, I posted it in post 43, 9.48 volts but battery had been on battery tender for a few hours so starting voltage is slightly higher than in preheat test. The main thing in the crank position is that the glow switch is making intermittent contact.

Thank you for the info.

pretty obvious I’ve ordered parts. No point in further testing at this point. Pretty obvious that many of you don’t bother to read the results I’ve posted thus far. I appreciate the help, but nobody seems to comprehend that the switch is bad.

As stated above, 12.65 in, 9.48 at the firewall, no plugs connected, just the glow indicator. Similar results to glow position test, other than contacts making intermittent contact. I’ve ordered a new switch and glow indicator. With indicator in circuit, voltage should supposedly drop 1.0-1.5...

Thanks for clarifying. I’ve essentially done that test for the preheat position. .25 ohm resistance, 12.5v into switch. 11.5 at glow plug terminal of switch, no load, 9.25 out at glow plug terminal under hood. With indicator connected. I’ve had the battery on a battery tender for a day or so ...

Got it! Can’t run Wolfman’s test until I get dash hooked back up

So darn near 70 amps thru the switch without a relay. After 35+ years of heat and oxidation, I’m surprised it hasn’t melted down by now!

Tha thanks Wolfman. Seems crazy to run that kind of current through the switch without a relay. I’ll run the other test once I get it back together. I’m guessing the only thing glowing in the circuit is the switch contacts!

No glow of indicator, at all. doesn’t seem to even get hot, yet it’s not open.

4 glow plugs, so 40a. Plugs measure .58-.60 ohms.

Wolfman, I’m not able to perform that test right now because I’ve already pulled the dash apart. I will tell you that with glow plugs disconnected, I get 12.5 volts into switch and 9.25 volts at glow plug connector in engine compartment with switch on pre-heat.

Bingo! Go read post #7.