Scunthorpe looked set for victory when centre-back Niall Canavan added the finishing touch to an inswinging corner from Andy Dawson to open the scoring after 52 minutes.
Six minutes later the visitors were reduced to 10 men when skipper Ricky Ravenhill was sent off for a second bookable offence.
But Northampton came fighting back with a 66th minute equaliser when centre back Zander Diamond headed home a free-kick from Darren Carter.
"My team gave me everything," Wilder declared, "especially when we were down to 10 men.
"Losing Ricky was a blow to us but we dug in and whether we deserved a point or not, we got it.
"It's important for us to try and keep our run going and keep the level of confidence high.
"Coming here to Scunthorpe we would certainly have settled for a point before the start.
"We knew it would be difficult because Russ Wilcox has done a magnificent job to take them 19 games unbeaten.
"In the first half I thought we were well in the game.
"I expected a response from Scunthorpe in the second half and they gave one.
"They put us under pressure but I did think our goalkeeper was impeded when they got their goal from a corner.
"I was delighted with our equaliser from Zander Diamond and we then hung on for a draw.
"When we got another free-kick in injury time I was trying to urge Zander forward again, but I cannot blame the players for wanting to settle for the draw."