Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Yes, key was in the on or run position. Most of the other smaller style fuses in the under hood fuse box had powerexcept the ones I mentionedspecifically. I am original owner (bought new with 10 miles or so) and vehicle has 211,000 miles (mostly highway with regular oil changes and maintenance).
It had a lot or repairs in the first year and a half, including a complete transmission replacement, 2 ABS module replacements, and every electric window relay went out one after one. I had an extended warranty, and later looked at the id tag and found that it was in the first batch of Chevys manufactured in a plant that had just been built in Mexico. After the first year, no major repairs to speak of. In the last 6 months, just a fuel pump (original fuel pump went out).
NO. There is NO VOLTAGE to terminals 30 and 85. Also there is no voltage to terminal 86, but terminal 87 has 12 volts.
The relay is installed exactly as the schematic shows with IGN showing terminal 30 (nearest motor) and terminal 85 (nearest fender) both on the right side of the IGN 1 relay, which is the firewall side.
I then substituted a new relay in the IGN 1 slot oriented properly, and engine turns over but will not start.
Ok if 87 has voltage the relay is in wrong, 87 should get voltage from terminal 30 when the relay is activated. But 85 should also have voltage and that gets it power right from the battery with no fuses in between, it does connect through the under hood fuse box so the fuse box itself is most likely the problem, they often get corroded under the fuse box or the problem is inside the circuitry of the fuse box.
Okay, I believe you that there is a problem with the circuitry of the under hood fuse box.
However, the relay was NOT installed wrong, it was not installed at all when I checked the voltages. I pulled the relay out completely to use the multimeter's needle probe to contact the slots that the relay plugs into. If this was not a valid test, then I need to take the top off of the relay to do the test. Should I try to check the voltages with the relay IN?
There is no doubt in the schematic as to how to install the relay as the BIG 50 A fuses are shown to be to the engine side and the relay numbers are clearly posted relative to them
So are you saying the relay can not be installed in both dirrections/flipped?
No, it cannot be flipped. I am absolutely sure that the relay is installed consistent with the schematic glued to the under hood fuse box cover. The test was done and voltages measured with the relay removed.
Does the relay look like the pic below or all the terminals the same and aligned with each other?
No, it does not look like the picture. It is 1 inch by 1 inch square and the blades or terminals are aligned with each other in the same direction. The white numbers on the relay are 3614 with HELLA molded into it and the numbers 12193614 molded into it. The orientation looks like:
40A 50A 50A 50A 30A
87- 85- - blade direction
The relay cannot be turned around. The terminals will not go in because the relay is square but the terminals are offset to one side and there is a ridge which won't let it go in upside down. There are 3 more relays and they are all the same, they cannot be put into the IGN 1 slot upside down.
Now the truck was running with the existing relays and something else must have happened but all of the other fuses in the fuse box seem to have power with the exception of the ones I mentioned before. So from what you have told me, the IGN 1 relay has to proveide power to those fuses and its primary must be the issue, according to what info thah you have provided. It looks like I am going to have to tow to a dealership and get a rental to go to work inthe am.
How do people add another relay holder to an existing fuse box?
I am going to carpool with my kid tomorrow (he has exams - just a half day) and will try your suggestion tomorrow afternoon. I will reply first then accept your answer because i have not used this service before but i learned a lot from you. Also, electrical problems can drive anybody nuts, especially when you do not have the opportunity to see the vehicle.
I am very satisfied and I appreciate your time and wish you had a shop in my neighborhood, but this online electrical diagnosis work was a real challenge. Thanks very much and I have to go with my son to run some last minute weekend errands.
Thank you again,